merge_label_check.yml

# Fail if the "Do Not Merge" label is present on a PR.
name: Merge label check
on: 
  pull_request:
    types:
      - opened
      - labeled
      - unlabeled
      - synchronize

permissions:
  contents: read
  pull-requests: read

jobs:
  new-check-for-merge-label:
    runs-on: ubuntu-latest
    name: "Merge is not allowed when 'Do Not Merge' label is present"
    steps:
      - name: Verify lack of "Do Not Merge" label
        env:
          DO_NOT_MERGE_LABEL_IS_PRESENT: ${{ contains( github.event.pull_request.labels.*.name, 'Do Not Merge') }}
        run: |
          if [[ $DO_NOT_MERGE_LABEL_IS_PRESENT == "true" ]]; then
          exit 1
          else
          exit 0
          fi