Cleanuparr/.github/workflows/stack-rerun.yml

name: Stack Rerun

on:
  pull_request:
    types: [closed]

permissions:
  contents: read

jobs:
  rerun:
    runs-on: ubuntu-latest
    timeout-minutes: 2
    if: github.event.pull_request.head.repo.full_name == github.repository
    permissions:
      actions: write
      contents: read
      pull-requests: read
    steps:
      # Closing the top PR makes the PR below the new top, but no event re-triggers its skipped runs
      - name: Re-run CI on the PR below
        uses: actions/github-script@v9
        with:
          script: |
            const { owner, repo } = context.repo;
            const base = context.payload.pull_request.base.ref;
            const { data: prs } = await github.rest.pulls.list({
              owner, repo, state: 'open', head: `${owner}:${base}`,
            });
            for (const pr of prs) {
              for (const workflow_id of ['test.yml', 'build-docker.yml']) {
                const { data } = await github.rest.actions.listWorkflowRuns({
                  owner, repo, workflow_id, event: 'pull_request', head_sha: pr.head.sha, per_page: 1,
                });
                const run = data.workflow_runs[0];
                if (run?.status !== 'completed') {
                  continue;
                }
                try {
                  const { data: { jobs } } = await github.rest.actions.listJobsForWorkflowRun({ owner, repo, run_id: run.id });
                  // Jobs guarded by the stack gate
                  const gated = jobs.some(j => ['backend', 'frontend', 'prepare'].includes(j.name) && j.conclusion === 'skipped');
                  if (gated) {
                    await github.rest.actions.reRunWorkflow({ owner, repo, run_id: run.id });
                  }
                } catch (error) {
                  core.warning(`${workflow_id} #${pr.number}: ${error.message}`);
                }
              }
            }