check_pr_branch.yml

name: check PR branch

on:
  pull_request:
    types:
      - opened
      - synchronize
      - reopened
      - edited

jobs:
  check-PR-branch:
    runs-on: ubuntu-latest
    steps:
      - name: PRs should not target main
        run: |
          if [[ "${{ github.base_ref }}" == "main" ]]; then
            echo 'Pull requests must not be made against main. Please target development instead.'
            exit 1
          fi