auto-pr-merge.yml

name: Auto Merge Contributor PRs

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

permissions:
  contents: write
  pull-requests: write

jobs:
  auto-merge:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check only Contributors.md was modified
        id: check-files
        run: |
          CHANGED=$(git diff --name-only origin/${{ github.base_ref }}...HEAD)
          echo "Changed files: $CHANGED"
          if [ "$CHANGED" = "Contributors.md" ]; then
            echo "valid=true" >> $GITHUB_OUTPUT
          else
            echo "valid=false" >> $GITHUB_OUTPUT
            echo "PR modifies files other than Contributors.md — skipping auto-merge."
          fi

      - name: Auto-merge PR
        if: steps.check-files.outputs.valid == 'true'
        run: gh pr merge --squash "${{ github.event.pull_request.number }}"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}