name: Approve & merge successful dependabot patch upgrade PRs
on: pull_request

permissions:
  pull-requests: read

jobs:
  dependabot:
    runs-on: ubuntu-latest
    if: ${{ github.actor == 'dependabot[bot]' }}
    steps:
      - name: Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@v1
      - name: Approve the PR & enable auto-merge
        if: ${{ steps.metadata.outputs.update-type == 'version-update:semver-patch' }}
        run: |
          gh pr review --approve "$PR_URL"
          gh pr merge --auto --merge "$PR_URL"
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GH_TOKEN: ${{secrets.SERVO_DEPENDABOT_TOKEN}}