automerge.yml

name: automerge
on:
  pull_request_target:
    types: [opened, edited]
    paths-ignore: ['.github/**/*', '.github']

jobs:
  checkEdits:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout pull request branch on forked repo
      uses: actions/checkout@v2
      with:
        fetch-depth: 0
        ref: ${{github.event.pull_request.head.ref}}
        repository: ${{github.event.pull_request.head.repo.full_name}}
        token: ${{ github.token }}
    - name: Check for blacklisted edits
      run: |
        #!/bin/bash
        head=$(git rev-parse --abbrev-ref HEAD)
        echo - head: $head
        main=$(git merge-base $head origin/main)
        echo - main: $main
        diff_cmd="git diff --name-only $head $main"
        echo - diff_cmd: $diff_cmd
        diffs=$($diff_cmd)
        echo '- diff_cmd result (below):'
        echo $diffs
        echo '- forbidden edits (below):'
        if grep -i '\.github' <<<$diffs; then
          exit 1;
        else
          exit 0;
        fi
  automerge:  # https://github.com/marketplace/actions/merge-pull-requests-automerge-action
    needs: checkEdits
    runs-on: ubuntu-latest
    steps:
      - name: automerge
        uses: "pascalgn/automerge-action@v0.14.3"
        env:
          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
          MERGE_LABELS: ""
          MERGE_DELETE_BRANCH: true