auto-merge-dependabot.yml

# https://github.com/dependabot/fetch-metadata#enabling-auto-merge
name: Auto-merge Dependabot

on: pull_request_target

permissions:
  pull-requests: write
  contents: write

jobs:
  dependabot:
    name: 'Dependabot'
    runs-on: ubuntu-latest
    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
    permissions:
      # Required for auto-merge – https://github.com/dependabot/fetch-metadata?tab=readme-ov-file#enabling-auto-merge
      contents: write
      # Required for auto-approving – https://github.com/dependabot/fetch-metadata?tab=readme-ov-file#auto-approving
      pull-requests: write
    steps:
      - name: Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@v1

      - name: Enable auto-merge for Dependabot PRs
        # Conditionals for when it's safe. For now, all passing checks is fine.
        # if: ${{contains(steps.metadata.outputs.dependency-names, 'rails') && steps.metadata.outputs.update-type == 'version-update:semver-patch'}}
        run: gh pr merge --auto --merge "$PR_URL"
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

      - uses: actions/checkout@v4
      - name: Approve a PR if not already approved
        run: |
          gh pr checkout "$PR_URL" # sets the upstream metadata for `gh pr status`
          if [ "$(gh pr status --json reviewDecision -q .currentBranch.reviewDecision)" != "APPROVED" ];
          then gh pr review --approve "$PR_URL"
          else echo "PR already approved, skipping additional approvals to minimize emails/notification noise.";
          fi
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}