feat(ci): cleanup backport branches

[Piotr1215]

Note

Adds a GitHub Actions workflow to auto-delete merged backport branches immediately on merge and via a weekly/manual cleanup with optional dry-run.

• CI/GitHub Actions:
  • New workflow /.github/workflows/cleanup-backport-branches.yaml with contents: write.
    • Triggers: pull_request (closed), weekly schedule (Sun 02:00 UTC), and workflow_dispatch with dry_run option.
    • Delete-on-merge job: removes backport/* branch on merged PR using jessfraz/branch-cleanup-action@master.
    • Scheduled/manual cleanup job:
      • Checks out repo and identifies origin default branch.
      • Finds backport/* branches merged into main and older than 7 days via git history.
      • Deletes branches (or logs in dry-run) and prints summary.
      • Uses GH_ACCESS_TOKEN for auth.

^{Written by Cursor Bugbot for commit 5bfc581. This will update automatically on new commits. Configure here.}

References OPS-373

[cursor]

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