pr-target-check.yml

name: PR Target Check

on:
  pull_request:
    types: [opened, reopened, edited, synchronize]

jobs:
  check-target:
    runs-on: ubuntu-latest
    steps:
      - name: Enforce branch strategy
        run: |
          BASE="${{ github.event.pull_request.base.ref }}"
          HEAD="${{ github.event.pull_request.head.ref }}"

          echo "PR: $HEAD → $BASE"

          if [ "$BASE" = "master" ] && [ "$HEAD" != "develop" ]; then
            echo "❌ Only the 'develop' branch can open PRs to 'master'."
            echo "   Please target 'develop' instead."
            exit 1
          fi

          if [ "$BASE" = "develop" ] && [ "$HEAD" = "master" ]; then
            echo "❌ Do not merge 'master' back into 'develop'."
            exit 1
          fi

          echo "✅ PR target is valid: $HEAD → $BASE"