do_not_merge.yml

name: label check

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

jobs:
  block:
    name: Block if do not merge
    runs-on: ubuntu-latest
    steps:
      - uses: mheap/github-action-required-labels@v2
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          mode: exactly
          count: 0
          labels: "do not merge"