dependabot_auto_approve_and_merge.yml

name: Dependabot auto-approve
on: pull_request

permissions:
  pull-requests: write
  contents: write

jobs:
  dependabot:
    runs-on: ubuntu-latest
    if: ${{ github.actor == 'dependabot[bot]' }}
    steps:
      - name: Get token from Github App
        id: get_app_token
        uses: actions/create-github-app-token@v1
        with:
          app-id: ${{ secrets.AUTOMERGE_APP_ID }}
          private-key: ${{ secrets.AUTOMERGE_PEM }}    
      - name: Dependabot metadata
        id: dependabot-metadata
        uses: dependabot/fetch-metadata@v2
        with:
          github-token: "${{ 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: ${{ steps.get_app_token.outputs.token }}
      - name: Approve major updates of development dependencies
        if: ${{steps.dependabot-metadata.outputs.update-type == 'version-update:semver-major' && steps.dependabot-metadata.outputs.dependency-type == 'direct:development'}}
        run: gh pr review "$PR_URL" --approve -b "I'm **approving** this pull request because **it includes a major update of a dependency used only in development**"
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GITHUB_TOKEN: ${{ steps.get_app_token.outputs.token }}
      - name: Comment on major updates of non-development dependencies
        if: ${{steps.dependabot-metadata.outputs.update-type == 'version-update:semver-major' && steps.dependabot-metadata.outputs.dependency-type == 'direct:production'}}
        run: |
          gh pr comment "$PR_URL" --body "I'm **not approving** this PR because **it includes a major update of a dependency used in production**"
          gh pr edit "$PR_URL" --add-label "requires-manual-qa"
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GITHUB_TOKEN: ${{ steps.get_app_token.outputs.token }}
      # enable auto merge on all dependabot prs
      - name: Enable auto-merge for Dependabot PRs
        run: gh pr merge --auto --squash "$PR_URL"
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GITHUB_TOKEN: ${{ steps.get_app_token.outputs.token }}