steal some of @tcsenpai 's changes from the PR

+ ditch the LAST FM API KEY thing
+ expose the Musixmatch urls
+ use the kerve last fm api to download similar artist data
+ use google.it instead of the Google public dns to check internet connectivity (to make it work in all environments)
+ return og Dockerfile to fix ARM support

.github/contributing.md

@@ -39,8 +39,6 @@ cd swingmusic
 poetry install
 ```
 
-You need a LastFM API key which you can get on the [API accounts page](https://www.last.fm/api/accounts). Then set it as an environment variable under the name: `LASTFM_API_KEY`.
-
 Finally, run the server. You can use a different port if you have another Swing Music instance running on port `1970`.
 
 ```sh

.github/workflows/release.yml

@@ -72,9 +72,6 @@ jobs:
         run: |
           python -m poetry run python manage.py --build
         env:
-          LASTFM_API_KEY: ${{ secrets.LASTFM_API_KEY }}
-          PLUGIN_LYRICS_AUTHORITY: ${{ secrets.PLUGIN_LYRICS_AUTHORITY }}
-          PLUGIN_LYRICS_ROOT_URL: ${{ secrets.PLUGIN_LYRICS_ROOT_URL }}
           SWINGMUSIC_APP_VERSION: ${{ inputs.tag }}
       - name: Verify Linux build success
         if: matrix.os == 'ubuntu-20.04'