auto-merge.yml

# Auto Merge
#
# Automatically merge pull requests after requirements are met.
#
# References:
#
# - https://cli.github.com/manual/gh_auth_status
# - https://cli.github.com/manual/gh_pr_merge
# - https://docs.github.com/actions/learn-github-actions/contexts
# - https://docs.github.com/actions/learn-github-actions/expressions
# - https://docs.github.com/actions/using-workflows/events-that-trigger-workflows#pull_request
# - https://docs.github.com/actions/using-workflows/using-github-cli-in-workflows
# - https://docs.github.com/actions/using-workflows/workflow-commands-for-github-actions
# - https://docs.github.com/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/managing-auto-merge-for-pull-requests-in-your-repository
# - https://docs.github.com/webhooks-and-events/webhooks/webhook-events-and-payloads#pull_request
# - https://github.com/actions/checkout
# - https://github.com/actions/create-github-app-token
# - https://github.com/hmarr/debug-action

---
name: auto-merge
on: pull_request
jobs:
  auto-merge:
    if: github.event.pull_request.auto_merge == null && !github.event.pull_request.draft
    runs-on: ubuntu-latest
    steps:
      - id: debug
        name: Print environment variables and event payload
        uses: hmarr/debug-action@v3.0.0
      - id: bot-token
        name: Get bot token
        uses: actions/create-github-app-token@v1.10.0
        with:
          app-id: ${{ secrets.BOT_APP_ID }}
          private-key: ${{ secrets.BOT_PRIVATE_KEY }}
      - id: github-token
        name: Set env.GITHUB_TOKEN
        run: echo "GITHUB_TOKEN=${{ steps.bot-token.outputs.token }}" >>$GITHUB_ENV
      - id: checkout
        name: Checkout ${{ github.head_ref }}
        uses: actions/checkout@v4.1.5
        with:
          persist-credentials: false
          ref: ${{ github.head_ref }}
          token: ${{ steps.bot-token.outputs.token }}
      - id: gh-auth
        name: Check gh authentication state
        run: gh auth status
      - id: enable
        name: Enable auto-merge
        run: gh pr merge ${{ github.event.number }} --auto --squash