feat(templates): git compose import, six stack seeds, empty-default vars (#63)

* feat(templates): git compose import, six stack seeds, empty-default vars

- POST /templates/import/git fetches a compose file from any git remote
  (clone URL, ssh, owner/repo via connected providers — private repos
  included), ref selects branch or commit. Path defaults through
  compose.yaml/yml then docker-compose.yml/yaml. Reuses the build-on-node
  checkout machinery; repo-relative paths are containment-checked.
- CLI `templates import-git <repo> [path] [--ref]`, MCP
  containr_templates_import_git, OpenAPI entry, and a paste/git toggle
  in the template import dialog.
- {{VAR:-}} with an empty default now resolves instead of reporting the
  var missing — matches shell :- semantics.
- SeedTemplates gains six official graph stacks — n8n (pg+redis+worker),
  Gitea, Nextcloud, Vaultwarden, Umami, Immich — wired with
  {{service.*}} refs and {{secret}} credentials; no hardcoded passwords.
- TestSeedTemplatesResolveCleanly parses, topo-sorts, validates, and
  resolves every seeded graph — catalog drift can't merge silently.
- templates/n8n.md compose block had invalid YAML (mixed depends_on
  list/map) — fixed so the documented stack actually parses.

Verified live: import/git on a dumb-HTTP repo returns the converted
graph (db image → managed postgresql), path/ref/traversal/unauth edges
return clean errors, tpl-n8n plan resolves with zero unresolved vars.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* ci: pre-pull compose-smoke images via gcr mirror

Anonymous Docker Hub pulls rate-limit shared CI egress IPs — the compose
boot smoke flaked on traefik:pull. postgres/traefik are library/* images
served by mirror.gcr.io without auth; compose reuses the retagged local
images, falling back to a normal pull when the mirror misses.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* ci: route docker.io through gcr mirror for compose smoke

Pull-time pre-pulls don't cover BuildKit's base-image metadata lookups
(node:22-alpine, nginx:alpine, golang:1.26-alpine all 429). Daemon-level
registry-mirrors covers pulls and resolution in one move.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* ci: mirror docker.io in buildx for image publish job

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* ci: route smoke pulls/builds through mirror.gcr.io via compose overlay

daemon.json registry-mirrors isn't honored by the runner's containerd
image store. Qualify refs directly: ARG-parameterized Dockerfile FROMs
(defaults unchanged) plus a CI-only compose overlay that points image
pulls and build args at mirror.gcr.io.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

---------

Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/backend/Dockerfile

@@ -1,5 +1,7 @@
 # Build Go API binary
-FROM golang:1.26-alpine AS go-builder
+ARG GO_IMAGE=golang:1.26-alpine
+ARG NODE_IMAGE=node:22-alpine
+FROM ${GO_IMAGE} AS go-builder
 
 RUN apk add --no-cache git ca-certificates tzdata
 
@@ -18,7 +20,7 @@ RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "-X main.version=${V
     CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags "-X main.version=${VERSION}" -o /agents/containr-agent-linux-arm64 ./cmd/agent
 
 # Build embedded Better Auth runtime dependencies
-FROM node:22-alpine AS auth-builder
+FROM ${NODE_IMAGE} AS auth-builder
 
 WORKDIR /auth
 
@@ -28,7 +30,7 @@ RUN npm ci --omit=dev
 COPY auth/src ./src
 
 # Final runtime image (Go API + Better Auth sidecar in one container)
-FROM node:22-alpine
+FROM ${NODE_IMAGE}
 
 RUN apk --no-cache add ca-certificates tzdata wget git
 

app/backend/internal/api/routes.go

@@ -487,6 +487,7 @@ func SetupRoutes(router *gin.Engine, db *database.DB, redis *database.Redis, cfg
 			authed.POST("/templates/:id/deploy", handleCreateFromTemplate)
 			authed.POST("/templates/:id/plan", handlePlanTemplate)
 			authed.POST("/templates/import/compose", handleImportCompose)
+			authed.POST("/templates/import/git", handleImportGitCompose)
 			authed.POST("/templates/deploy", handleDeployInlineGraph)
 
 			authed.POST("/cron-jobs", handleCreateCronJob)

app/backend/internal/api/templategraph.go

@@ -11,6 +11,8 @@ import (
 	"log"
 	"math/big"
 	"net/http"
+	"os"
+	"path/filepath"
 	"regexp"
 	"sort"
 	"strconv"
@@ -22,6 +24,7 @@ import (
 	"containr/internal/deployment"
 	"containr/internal/deployqueue"
 	"containr/internal/secrets"
+	"containr/internal/source"
 
 	"github.com/gin-gonic/gin"
 	"github.com/google/uuid"
@@ -227,7 +230,9 @@ func resolveStaticExpr(value string, userVars map[string]string, unresolved *[]s
 		if val, ok := userVars[key]; ok {
 			return val
 		}
-		if sub[2] != "" {
+		// {{VAR:-x}} supplies a default; {{VAR:-}} declares an explicitly
+		// empty one. Both resolve — only a bare {{VAR}} is unresolved.
+		if strings.Contains(m, ":-") {
 			return sub[2]
 		}
 		if unresolved != nil {
@@ -1112,6 +1117,130 @@ func handleImportCompose(c *gin.Context) {
 	})
 }
 
+// handleImportGitCompose fetches a compose file out of a git repository and
+// runs it through the same conversion as handleImportCompose. Works with any
+// git remote — connected providers (including GitHub App installs) supply
+// credentials for private repos. Nothing is persisted; the response feeds
+// the template create form or a direct deploy.
+func handleImportGitCompose(c *gin.Context) {
+	userID, ok := requireAuthenticatedUserID(c)
+	if !ok {
+		return
+	}
+	db := c.MustGet("db").(*database.DB)
+
+	var req struct {
+		Repo string `json:"repo" binding:"required"`
+		Path string `json:"path"`
+		Ref  string `json:"ref"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	branch, commit := "", ""
+	if ref := strings.TrimSpace(req.Ref); ref != "" {
+		if isCommitSHA(ref) {
+			commit = ref
+		} else {
+			branch = ref
+		}
+	}
+	spec, err := resolveGitCloneSpec(db, userID, req.Repo, branch, commit, "")
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error(), "code": "VALIDATION"})
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(c.Request.Context(), 2*time.Minute)
+	defer cancel()
+	checkoutRoot := filepath.Join(containrWorkDir, "repos", "import-"+uuid.NewString())
+	defer os.RemoveAll(checkoutRoot)
+	repoDir, err := source.Checkout(ctx, checkoutRoot, spec)
+	if err != nil {
+		c.JSON(http.StatusBadGateway, gin.H{"error": "git fetch failed: " + err.Error(), "code": "GIT_FETCH"})
+		return
+	}
+
+	// Default search order mirrors common compose conventions.
+	candidates := []string{req.Path}
+	if strings.TrimSpace(req.Path) == "" {
+		candidates = []string{"compose.yaml", "compose.yml", "docker-compose.yml", "docker-compose.yaml"}
+	}
+	var raw []byte
+	for _, rel := range candidates {
+		p, rerr := resolveRepoFile(repoDir, rel)
+		if rerr != nil {
+			continue
+		}
+		raw, err = os.ReadFile(p)
+		if err == nil {
+			break
+		}
+	}
+	if raw == nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "compose file not found in repository", "code": "NOT_FOUND"})
+		return
+	}
+	if len(raw) > 512*1024 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Compose file exceeds 512 KiB"})
+		return
+	}
+
+	var file composeFileDef
+	if err := yaml.Unmarshal(raw, &file); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid compose YAML: " + err.Error()})
+		return
+	}
+	services, warnings, convErr := composeToSpecs(&file)
+	if convErr != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": convErr.Error()})
+		return
+	}
+	config := TemplateConfig{Version: 2, Services: services}
+	configJSON, _ := json.Marshal(config)
+	c.JSON(http.StatusOK, gin.H{
+		"config":    json.RawMessage(configJSON),
+		"variables": []TemplateVariable{},
+		"warnings":  warnings,
+	})
+}
+
+// resolveRepoFile maps a repo-relative file path onto the checkout and
+// rejects escapes — same containment rule as ResolveBuildPath, for files.
+func resolveRepoFile(checkoutDir, rel string) (string, error) {
+	rel = strings.TrimSpace(rel)
+	if rel == "" || filepath.IsAbs(rel) {
+		return "", fmt.Errorf("invalid repo path %q", rel)
+	}
+	clean := filepath.Clean(rel)
+	if clean == ".." || strings.HasPrefix(clean, ".."+string(filepath.Separator)) {
+		return "", fmt.Errorf("path escapes the checkout: %q", rel)
+	}
+	resolved := filepath.Join(checkoutDir, clean)
+	info, err := os.Stat(resolved)
+	if err != nil {
+		return "", fmt.Errorf("path %q not found in checkout", rel)
+	}
+	if !info.Mode().IsRegular() {
+		return "", fmt.Errorf("path %q is not a file", rel)
+	}
+	return resolved, nil
+}
+
+func isCommitSHA(ref string) bool {
+	if len(ref) != 40 {
+		return false
+	}
+	for _, r := range ref {
+		if !('0' <= r && r <= '9') && !('a' <= r && r <= 'f') {
+			return false
+		}
+	}
+	return true
+}
+
 // composeToSpecs converts a parsed compose file into graph service specs.
 // Compose service names become keys; declaration order follows YAML document
 // order — yaml.v3 maps lose order, so sort keys for stability.

app/backend/internal/api/templategraph_compose_test.go

@@ -1,6 +1,8 @@
 package api
 
 import (
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 
@@ -124,3 +126,42 @@ func TestComposeToSpecsWarnings(t *testing.T) {
 		t.Errorf("missing env warning: %v", warnings)
 	}
 }
+
+func TestResolveRepoFileContainment(t *testing.T) {
+	dir := t.TempDir()
+	inner := filepath.Join(dir, "sub")
+	if err := os.MkdirAll(inner, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(inner, "compose.yml"), []byte("x"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	p, err := resolveRepoFile(dir, "sub/compose.yml")
+	if err != nil {
+		t.Fatalf("valid file rejected: %v", err)
+	}
+	if p != filepath.Join(dir, "sub", "compose.yml") {
+		t.Errorf("unexpected path %q", p)
+	}
+
+	for _, bad := range []string{"", "/etc/passwd", "../escape.yml", "..", "sub/../../out.yml"} {
+		if _, err := resolveRepoFile(dir, bad); err == nil {
+			t.Errorf("path %q should have been rejected", bad)
+		}
+	}
+	if _, err := resolveRepoFile(dir, "sub"); err == nil {
+		t.Error("directory accepted as file")
+	}
+}
+
+func TestIsCommitSHA(t *testing.T) {
+	if !isCommitSHA("0123456789abcdef0123456789abcdef01234567") {
+		t.Error("40-hex ref not recognised as a commit")
+	}
+	for _, bad := range []string{"main", "v1.2.3", "0123456789abcdef0123456789abcdef0123456", "0123456789abcdef0123456789abcdef0123456G"} {
+		if isCommitSHA(bad) {
+			t.Errorf("ref %q misclassified as commit SHA", bad)
+		}
+	}
+}

app/backend/internal/api/templates.go

@@ -1102,6 +1102,98 @@ func SeedTemplates() []ServiceTemplate {
 			Variables:  `[{"key":"APP_URL","label":"Public URL","default":"","required":false,"secret":false}]`,
 			IsOfficial: true,
 		},
+		{
+			ID:          "tpl-n8n",
+			Name:        "n8n + PostgreSQL + Redis",
+			Description: "Workflow automation in queue mode with managed PostgreSQL and Redis",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/n8n",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"postgresql","environment":{"POSTGRES_DB":"n8n","POSTGRES_USER":"n8n"},"volumes":[{"source":"n8n-db","target":"/var/lib/postgresql/data"}]},
+				{"key":"redis","type":"database","runtime":"redis"},
+				{"key":"n8n","type":"web","runtime":"docker.n8n.io/n8nio/n8n:latest","port":5678,"health_check":"/healthz","depends_on":["db","redis"],
+				 "environment":{"DB_TYPE":"postgresdb","DB_POSTGRESDB_HOST":"{{service.db.host}}","DB_POSTGRESDB_PORT":"5432","DB_POSTGRESDB_DATABASE":"{{service.db.database}}","DB_POSTGRESDB_USER":"{{service.db.user}}","DB_POSTGRESDB_PASSWORD":"{{service.db.password}}","QUEUE_BULL_REDIS_HOST":"{{service.redis.host}}","QUEUE_BULL_REDIS_PASSWORD":"{{service.redis.password}}","EXECUTIONS_MODE":"queue","N8N_ENCRYPTION_KEY":"{{secret(32)}}","N8N_HOST":"{{APP_URL:-http://localhost:5678}}","N8N_EDITOR_BASE_URL":"{{APP_URL:-http://localhost:5678}}"},
+				 "volumes":[{"source":"n8n-data","target":"/home/node/.n8n"}]},
+				{"key":"worker","name":"n8n-worker","type":"worker","runtime":"docker.n8n.io/n8nio/n8n:latest","start_command":"worker","depends_on":["n8n","db","redis"],
+				 "environment":{"DB_TYPE":"postgresdb","DB_POSTGRESDB_HOST":"{{service.db.host}}","DB_POSTGRESDB_PORT":"5432","DB_POSTGRESDB_DATABASE":"{{service.db.database}}","DB_POSTGRESDB_USER":"{{service.db.user}}","DB_POSTGRESDB_PASSWORD":"{{service.db.password}}","QUEUE_BULL_REDIS_HOST":"{{service.redis.host}}","QUEUE_BULL_REDIS_PASSWORD":"{{service.redis.password}}","EXECUTIONS_MODE":"queue","N8N_ENCRYPTION_KEY":"{{secret(32)}}","QUEUE_HEALTH_CHECK_ACTIVE":"true"},
+				 "volumes":[{"source":"n8n-data","target":"/home/node/.n8n"}]}]}`,
+			Variables:  `[{"key":"APP_URL","label":"Public URL","default":"","required":false,"secret":false}]`,
+			IsOfficial: true,
+		},
+		{
+			ID:          "tpl-gitea",
+			Name:        "Gitea + PostgreSQL",
+			Description: "Self-hosted git service with managed PostgreSQL",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/gitea",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"postgresql","environment":{"POSTGRES_DB":"gitea","POSTGRES_USER":"gitea"},"volumes":[{"source":"gitea-db","target":"/var/lib/postgresql/data"}]},
+				{"key":"gitea","type":"web","runtime":"gitea/gitea:latest","port":3000,"health_check":"/api/healthz","depends_on":["db"],
+				 "environment":{"GITEA__database__DB_TYPE":"postgres","GITEA__database__HOST":"{{service.db.host}}:{{service.db.port}}","GITEA__database__NAME":"{{service.db.database}}","GITEA__database__USER":"{{service.db.user}}","GITEA__database__PASSWD":"{{service.db.password}}","GITEA__security__INSTALL_LOCK":"true","GITEA__security__SECRET_KEY":"{{secret(32)}}","GITEA__security__INTERNAL_TOKEN":"{{secret(64)}}","GITEA__server__DOMAIN":"{{DOMAIN:-localhost}}","GITEA__server__ROOT_URL":"{{ROOT_URL:-http://localhost:3000}}","GITEA__server__SSH_PORT":"2222","USER_UID":"1000","USER_GID":"1000"},
+				 "volumes":[{"source":"gitea-data","target":"/data"}]}]}`,
+			Variables:  `[{"key":"DOMAIN","label":"Public domain","default":"","required":false,"secret":false},{"key":"ROOT_URL","label":"Root URL","default":"","required":false,"secret":false}]`,
+			IsOfficial: true,
+		},
+		{
+			ID:          "tpl-nextcloud",
+			Name:        "Nextcloud + PostgreSQL + Redis",
+			Description: "Self-hosted file sync and collaboration with managed PostgreSQL and Redis",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/nextcloud",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"postgresql","environment":{"POSTGRES_DB":"nextcloud","POSTGRES_USER":"nextcloud"},"volumes":[{"source":"nextcloud-db","target":"/var/lib/postgresql/data"}]},
+				{"key":"redis","type":"database","runtime":"redis"},
+				{"key":"nextcloud","type":"web","runtime":"nextcloud:latest","port":80,"depends_on":["db","redis"],
+				 "environment":{"POSTGRES_HOST":"{{service.db.host}}","POSTGRES_DB":"{{service.db.database}}","POSTGRES_USER":"{{service.db.user}}","POSTGRES_PASSWORD":"{{service.db.password}}","REDIS_HOST":"{{service.redis.host}}","REDIS_HOST_PASSWORD":"{{service.redis.password}}","NEXTCLOUD_ADMIN_USER":"admin","NEXTCLOUD_ADMIN_PASSWORD":"{{secret(24)}}","NEXTCLOUD_TRUSTED_DOMAINS":"{{DOMAIN:-localhost}}","OVERWRITEHOST":"{{DOMAIN:-}}","OVERWRITEPROTOCOL":"https"},
+				 "volumes":[{"source":"nextcloud-data","target":"/var/www/html"}]}]}`,
+			Variables:  `[{"key":"DOMAIN","label":"Trusted domain","default":"localhost","required":false,"secret":false}]`,
+			IsOfficial: true,
+		},
+		{
+			ID:          "tpl-vaultwarden",
+			Name:        "Vaultwarden + PostgreSQL",
+			Description: "Bitwarden-compatible password manager with managed PostgreSQL",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/vaultwarden",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"postgresql","environment":{"POSTGRES_DB":"vaultwarden","POSTGRES_USER":"vaultwarden"},"volumes":[{"source":"vaultwarden-db","target":"/var/lib/postgresql/data"}]},
+				{"key":"vaultwarden","type":"web","runtime":"vaultwarden/server:latest","port":80,"health_check":"/alive","depends_on":["db"],
+				 "environment":{"DATABASE_URL":"{{service.db.url}}","ADMIN_TOKEN":"{{secret(48)}}","DOMAIN":"{{DOMAIN:-http://localhost:80}}","SIGNUPS_ALLOWED":"false","WEBSOCKET_ENABLED":"true"},
+				 "volumes":[{"source":"vaultwarden-data","target":"/data"}]}]}`,
+			Variables:  `[{"key":"DOMAIN","label":"Public URL","default":"","required":false,"secret":false}]`,
+			IsOfficial: true,
+		},
+		{
+			ID:          "tpl-umami",
+			Name:        "Umami + PostgreSQL",
+			Description: "Lightweight privacy-first web analytics with managed PostgreSQL",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/umami",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"postgresql","environment":{"POSTGRES_DB":"umami","POSTGRES_USER":"umami"},"volumes":[{"source":"umami-db","target":"/var/lib/postgresql/data"}]},
+				{"key":"umami","type":"web","runtime":"ghcr.io/umami-software/umami:postgresql-latest","port":3000,"depends_on":["db"],
+				 "environment":{"DATABASE_URL":"{{service.db.url}}","APP_SECRET":"{{secret(32)}}"}}]}`,
+			Variables:  `[]`,
+			IsOfficial: true,
+		},
+		{
+			ID:          "tpl-immich",
+			Name:        "Immich + PostgreSQL + Redis",
+			Description: "Self-hosted photo and video backup with managed PostgreSQL and Redis",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/immich",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"postgresql","environment":{"POSTGRES_DB":"immich","POSTGRES_USER":"immich"},"volumes":[{"source":"immich-db","target":"/var/lib/postgresql/data"}]},
+				{"key":"redis","type":"database","runtime":"redis"},
+				{"key":"ml","name":"immich-machine-learning","type":"worker","runtime":"ghcr.io/immich-app/immich-machine-learning:release",
+				 "environment":{"DB_DATABASE_NAME":"{{service.db.database}}","DB_HOSTNAME":"{{service.db.host}}","DB_USERNAME":"{{service.db.user}}","DB_PASSWORD":"{{service.db.password}}","REDIS_HOSTNAME":"{{service.redis.host}}","REDIS_PASSWORD":"{{service.redis.password}}"},
+				 "volumes":[{"source":"immich-model-cache","target":"/cache"}]},
+				{"key":"immich","name":"immich-server","type":"web","runtime":"ghcr.io/immich-app/immich-server:release","port":2283,"health_check":"/api/server/ping","depends_on":["db","redis","ml"],
+				 "environment":{"DB_DATABASE_NAME":"{{service.db.database}}","DB_HOSTNAME":"{{service.db.host}}","DB_USERNAME":"{{service.db.user}}","DB_PASSWORD":"{{service.db.password}}","REDIS_HOSTNAME":"{{service.redis.host}}","REDIS_PASSWORD":"{{service.redis.password}}"},
+				 "volumes":[{"source":"immich-upload","target":"/usr/src/app/upload"}]}]}`,
+			Variables:  `[]`,
+			IsOfficial: true,
+		},
 	}
 	return templates
 }

app/backend/internal/api/templates_test.go

@@ -1,6 +1,9 @@
 package api
 
-import "testing"
+import (
+	"encoding/json"
+	"testing"
+)
 
 func TestNormalizeTemplateServiceType(t *testing.T) {
 	valid := []string{"web", "worker", "database", "cron"}
@@ -71,3 +74,32 @@ func TestResolveTemplateRuntimeImage(t *testing.T) {
 		t.Fatalf("expected unknown runtime passthrough, got %q", got)
 	}
 }
+
+func TestSeedTemplatesResolveCleanly(t *testing.T) {
+	for _, tpl := range SeedTemplates() {
+		var config TemplateConfig
+		if err := json.Unmarshal([]byte(tpl.Config), &config); err != nil {
+			t.Fatalf("%s: invalid config JSON: %v", tpl.ID, err)
+		}
+		var variables []TemplateVariable
+		if err := json.Unmarshal([]byte(tpl.Variables), &variables); err != nil {
+			t.Fatalf("%s: invalid variables JSON: %v", tpl.ID, err)
+		}
+		if len(config.Services) == 0 {
+			continue // legacy single-service template
+		}
+		sorted, err := topoSortServices(config.Services)
+		if err != nil {
+			t.Fatalf("%s: topo sort: %v", tpl.ID, err)
+		}
+		if err := validateTemplateGraph(sorted); err != nil {
+			t.Fatalf("%s: graph validation: %v", tpl.ID, err)
+		}
+		// User vars left empty — every expression must still resolve via
+		// defaults, secrets, or service refs.
+		graph := resolveTemplateGraph(sorted, map[string]string{})
+		if len(graph.unresolved) > 0 {
+			t.Fatalf("%s: unresolved expressions: %v", tpl.ID, graph.unresolved)
+		}
+	}
+}

app/backend/internal/cli/commands/templates.go

@@ -194,6 +194,32 @@ var templatesImportComposeCmd = &cobra.Command{
 	},
 }
 
+var templatesImportGitCmd = &cobra.Command{
+	Use:   "import-git <repo> [path]",
+	Short: "Fetch a compose file from a git repo and convert it into a template graph config",
+	Long:  "repo accepts a clone URL, ssh remote, or owner/repo shorthand resolved via connected git providers (private repos included). path defaults to compose.yaml/yml or docker-compose.yml/yaml. --ref selects a branch or commit.",
+	Args:  cobra.RangeArgs(1, 2),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		body := map[string]string{"repo": args[0]}
+		if len(args) > 1 {
+			body["path"] = args[1]
+		}
+		if v, _ := cmd.Flags().GetString("ref"); v != "" {
+			body["ref"] = v
+		}
+		c, err := client()
+		if err != nil {
+			return err
+		}
+		data, err := c.Do("POST", "/templates/import/git", body)
+		if err != nil {
+			return err
+		}
+		PrintRaw(data)
+		return nil
+	},
+}
+
 var templatesDeployGraphCmd = &cobra.Command{
 	Use:   "deploy-graph <project-id> <config.json|->",
 	Short: "Deploy an ad-hoc service graph (v2 config with services[]) without a stored template",
@@ -257,5 +283,6 @@ func init() {
 	templatesDeployCmd.Flags().StringArrayVar(&tplDeployVars, "var", nil, "Template variable override (KEY=VALUE, repeatable)")
 	templatesPlanCmd.Flags().StringArrayVar(&tplDeployVars, "var", nil, "Template variable override (KEY=VALUE, repeatable)")
 	templatesDeployGraphCmd.Flags().StringArrayVar(&tplDeployVars, "var", nil, "Template variable override (KEY=VALUE, repeatable)")
-	TemplatesCmd.AddCommand(templatesListCmd, templatesGetCmd, templatesCreateCmd, templatesDeleteCmd, templatesDeployCmd, templatesPlanCmd, templatesImportComposeCmd, templatesDeployGraphCmd)
+	templatesImportGitCmd.Flags().String("ref", "", "git branch or commit (default: remote HEAD)")
+	TemplatesCmd.AddCommand(templatesListCmd, templatesGetCmd, templatesCreateCmd, templatesDeleteCmd, templatesDeployCmd, templatesPlanCmd, templatesImportComposeCmd, templatesImportGitCmd, templatesDeployGraphCmd)
 }

app/backend/internal/mcpserver/server.go

@@ -133,6 +133,7 @@ func init() {
 	register(spec{"containr_templates_deploy", "Deploy a template into a project. Args: id (template), project_id.", "POST", "/templates/{id}/deploy", []string{"id"}, []string{"project_id"}, false})
 	register(spec{"containr_templates_plan", "Dry-resolve a template: expanded expressions, service refs, missing variables. Args: id, variables (object).", "POST", "/templates/{id}/plan", []string{"id"}, nil, false})
 	register(spec{"containr_templates_import_compose", "Convert docker-compose YAML into a v2 template graph config. Args: compose_yaml.", "POST", "/templates/import/compose", nil, []string{"compose_yaml"}, false})
+	register(spec{"containr_templates_import_git", "Fetch a compose file from a git repo (clone URL, ssh remote, or owner/repo via connected providers) and convert it into a v2 template graph config. Args: repo (required), path (default: compose.yaml/yml or docker-compose.yml/yaml), ref (branch or commit).", "POST", "/templates/import/git", nil, []string{"repo", "path", "ref"}, false})
 	register(spec{"containr_templates_deploy_graph", "Deploy an ad-hoc service graph without a stored template. Args: project_id, config ({services:[...]}), variables, plan, region.", "POST", "/templates/deploy", nil, []string{"project_id", "config", "variables", "plan", "region"}, false})
 	register(spec{"containr_projects_import_compose", "Deploy a docker-compose file straight into a project. Args: id (project), compose_yaml, variables, plan, region.", "POST", "/projects/{id}/import-compose", []string{"id"}, []string{"compose_yaml", "variables", "plan", "region"}, false})