do-not-merge.yml

name: Unmergable Labels Check

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

jobs:
  do-not-merge:
    name: Prevent Merging
    runs-on: ubuntu-latest
    steps:
      - name: Check for label
        run: |
          echo "${{ toJSON(github.event.*.labels.*.name) }}"
          node -e 'const forbidden = ["target: next major version", "PR Status: needs tests", "PR Status: in-progress", "blocked: needs rebase"];
           const match = ${{ toJSON(github.event.*.labels.*.name) }}.find(l => forbidden.includes(l));
           if (match) { 
            console.log("Cannot merge PRs that are labeled with " + match);
            process.exit(1) 
           }'