The cirruslabs/flutter job image has no Node.js, so JS-based actions fail with
'exec: node: not found'. Check out with plain git over the internal forgejo:3000
URL + job token, keeping the workflows Node-free.
git.comunes.org is Forgejo. Replicates the analyze + commons_core/app_seeds test
gate in .forgejo/workflows/ci.yml (per-push + PR). Dropped the GitLab-only Windows
job (no Forgejo Windows runner).
