auto-merge.yml

# Source: https://nicolasiensen.github.io/2022-07-23-automating-dependency-updates-with-dependabot-github-auto-merge-and-github-actions/
name: PR auto-merge
on: pull_request_target

permissions:
  pull-requests: write
  contents: write

jobs:
  review-dependabot-pr:
    runs-on: ubuntu-latest
    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
    steps:
      - name: Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@v2
        with:
          github-token: "${{ secrets.GITHUB_TOKEN }}"

      - name: Enable auto-merge for Dependabot PRs
        run: gh pr merge --auto --merge "$PR_URL"
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

      - name: Approve patch and minor updates
        if: ${{steps.dependabot-metadata.outputs.update-type == 'version-update:semver-patch' || steps.dependabot-metadata.outputs.update-type == 'version-update:semver-minor'}}
        run: gh pr review $PR_URL --approve -b "I'm **approving** this pull request because **it includes a patch or minor update**"
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
          
      - name: Comment on major updates of any dependencies
        if: ${{steps.dependabot-metadata.outputs.update-type == 'version-update:semver-major'}}
        run: |
          gh pr comment $PR_URL --body "I'm **not approving** this PR because **it includes a major update of a dependency**"
          gh pr edit $PR_URL --add-label "requires-manual-qa"
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

  review-mod-update-pr:
    runs-on: ubuntu-latest
    if: ${{ github.event.pull_request.title == 'Update Hugo module dependencies' }}
    steps:
      - name: Enable auto-merge for mod-update PRs
        run: gh pr merge --auto --merge "$PR_URL"
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}