Derive accepted PR labels from the repository #48

	name: PR label

	on:
	pull_request:
	types: [opened, reopened, synchronize, labeled, unlabeled]

	permissions:
	issues: read
	pull-requests: read

	jobs:
	labels:
	runs-on: ubuntu-latest
	steps:
	- name: Require a repository label
	uses: actions/github-script@v9
	with:
	script: \|
	const pullRequest = context.payload.pull_request;
	// Dependabot and friends label their own PRs (dependencies,
	// javascript, github_actions) and cannot be asked to pick a
	// changelog label, so the gate does not apply to them. Passing
	// rather than skipping the job keeps the check reportable if it
	// ever becomes a required status check.
	if (pullRequest.user.type === "Bot") {
	core.info(
	`Skipping the changelog label check for bot author ${pullRequest.user.login}.`,
	);
	return;
	}
	const repositoryLabels = await github.paginate(
	github.rest.issues.listLabelsForRepo,
	{ ...context.repo, per_page: 100 },
	(response) => response.data.map((label) => label.name),
	);
	const validLabels = new Set(repositoryLabels);
	const matched = pullRequest.labels
	.map((label) => label.name)
	.filter((label) => validLabels.has(label));
	if (matched.length === 0) {
	core.setFailed(
	`This PR needs at least one repository label. Available labels: ${repositoryLabels.sort().join(", ")}.`,
	);
	}

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