name: Auto-merge dependabot updates

on:
  pull_request:
    branches: [ main ]

permissions:
  pull-requests: write
  contents: write

jobs:

  dependabot-merge:

    runs-on: ubuntu-latest

    if: ${{ github.actor == 'dependabot[bot]' }}

    steps:
      - name: Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@v2.3.0
        with:
          github-token: "${{ secrets.GITHUB_TOKEN }}"

      - name: Enable auto-merge for Dependabot PRs
        # Only if version bump is not a major version change
        if: ${{steps.metadata.outputs.update-type != 'version-update:semver-major'}}
        run: gh pr merge --auto --merge "$PR_URL"
        env:
          PR_URL: ${{github.event.pull_request.html_url}}
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}