label-check.yml

name: Pull Request Label Checker
on:
  pull_request:
    types: [opened, edited, synchronize, labeled, unlabeled]
jobs:
  check-labels:
    name: prevent merge labels
    runs-on: ubuntu-latest

    steps:
    - name: backport master label found
      run: echo "Please do not backport into master, instead, create a PR targeting master and backport from it instead."; exit 1
      if: ${{ contains(github.event.*.labels.*.name, 'backport master') }}