name: Dependabot Pull Request Approve and Merge
on: pull_request_target
permissions:
  contents: read
jobs:
  dependabot:
    permissions:
      pull-requests: write
      contents: write
    runs-on: ubuntu-latest
    # Checking the actor will prevent your Action run failing on non-Dependabot
    # PRs but also ensures that it only does work for Dependabot PRs.
    if: ${{ github.actor == 'dependabot[bot]' }}
    steps:
      - uses: step-security/harden-runner@0634a2670c59f64b4a01f0f96f84700a4088b9f0 # v2.12.0
        with:
          egress-policy: audit
      - uses: actions/create-github-app-token@df432ceedc7162793a195dd1713ff69aefc7379e # v2.0.6
        id: app-token
        with:
          app-id: ${{ secrets.APP_ID }}
          private-key: ${{ secrets.PRIVATE_KEY }}
      # This first step will fail if there's no metadata and so the approval
      # will not occur.
      - name: Dependabot metadata
        id: dependabot-metadata
        uses: dependabot/fetch-metadata@d7267f607e9d3fb96fc2fbe83e0af444713e90b7 # v2.3.0
        with:
          github-token: "${{ steps.app-token.outputs.token }}"
      # Here the PR gets approved.
      - name: Approve a PR
        run: gh pr review --approve "$PR_URL"
        env:
          PR_URL: ${{ github.event.pull_request.html_url }}
          GITHUB_TOKEN: "${{ steps.app-token.outputs.token }}"
      # Finally, this sets the PR to allow auto-merging for patch and minor
      # updates if all checks pass
      - name: Enable auto-merge for Dependabot PRs
        if: ${{ steps.dependabot-metadata.outputs.update-type == 'version-update:semver-patch' }}
        run: gh pr merge --auto --squash "$PR_URL"
        env:
          PR_URL: ${{ github.event.pull_request.html_url }}
          GITHUB_TOKEN: "${{ steps.app-token.outputs.token }}"