Cleanup release-plz branches #18

	name: Cleanup release-plz branches

	on:
	schedule:
	- cron: "23 3 * * *"
	workflow_dispatch:

	permissions:
	contents: write
	pull-requests: read

	jobs:
	cleanup:
	runs-on: ubuntu-latest
	steps:
	- name: Delete stale release-plz branches
	uses: actions/github-script@v8
	with:
	script: \|
	const branches = await github.paginate(
	github.rest.repos.listBranches,
	{ owner: context.repo.owner, repo: context.repo.repo, per_page: 100 }
	);
	const openPullRequests = await github.paginate(
	github.rest.pulls.list,
	{
	owner: context.repo.owner,
	repo: context.repo.repo,
	state: "open",
	per_page: 100
	}
	);
	const activeBranches = new Set(
	openPullRequests
	.map(pr => pr.head?.ref)
	.filter(ref => ref?.startsWith("release-plz-"))
	);
	const stale = branches
	.filter(b => b.name.startsWith("release-plz-"))
	.filter(b => !activeBranches.has(b.name))
	.map(b => b.name);
	let deletedCount = 0;
	for (const branch of stale) {
	try {
	await github.rest.git.deleteRef({
	owner: context.repo.owner,
	repo: context.repo.repo,
	ref: `heads/${branch}`
	});
	core.info(`Deleted: ${branch}`);
	deletedCount += 1;
	} catch (e) {
	if (e.status === 422) {
	core.info(`Skip ${branch} (already deleted or protected)`);
	} else {
	core.warning(`Failed to delete ${branch}: ${e.message}`);
	}
	}
	}
	core.info(`Cleaned ${deletedCount} of ${stale.length} release-plz branches`);

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