harden github actions workflows

[wesleyboar]

Overview

Refactor gitflow actions for labels to be functional, easy to read, consistent, and less verbose.

Related

Builds upon:

• fix and test recent pr-label-checker changes #182
  • improve/test github pr label management #181
    • remove pr-label-checker complex ifs #180
      • make label checkers run on more specific events #179
        • remove pr title checker #178
          • fix: stop writing your changelogs manually #177

Same functionality as:

• improve/test github pr label management #181

Changes

• wrap assigner and checker in two simple wrappers
• add comments
• reduce name verbosity

Testing

1. Open PR with label set before clicking "Create pull request".
2. Check PR label checker is run.
3. Remove label from PR.
4. Check PR label checker is run.
5. Close & Reopen PR.
6. Check PR label checker is not run.
7. Add label.
8. Check PR label checker is run.

UI

N/A

Notes

Originally built following https://tiagomichaelsousa.dev/articles/stop-writing-your-changelogs-manually, but I made updates.

Known Issues

1. 🤷 After PR close, label remove, pr reopen; one label check will fail, because it runs before pr-open–triggered assignment finishes. No solution known besides making action run again (by manually re-running or by removing and adding label).
2. ❌ The changelog-updater.yaml is still untested did not update CHANGELOG.md.