Improve github action workflows (#36)

1. Only publish repos if tests passed in the first place
2. Make it possible to trigger publishing manually
3. Trigger publishing on new tags in addition to merges
4. Change the goreleaser `--rm-dist` flag in favor of `--clean`

.github/workflows/release.yml

@@ -30,6 +30,6 @@ jobs:
         with:
           distribution: goreleaser
           version: latest
-          args: release --rm-dist
+          args: release --clean
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}