name: Dependabot auto-merge

on: pull_request

permissions:
  contents: write
  pull-requests: write

jobs:
  auto-merge:
    runs-on: ubuntu-latest
    # Skip fork PRs entirely (the merge would fail anyway, but no need to run).
    if: >-
      github.event.pull_request.user.login == 'dependabot[bot]' &&
      github.event.pull_request.head.repo.full_name == github.repository
    steps:
      - name: Fetch Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@v3
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}

      - name: Enable auto-merge for patch and minor updates
        if: >-
          steps.metadata.outputs.update-type == 'version-update:semver-patch' ||
          steps.metadata.outputs.update-type == 'version-update:semver-minor'
        run: gh pr merge --auto --squash "$PR_URL"
        env:
          PR_URL: ${{ github.event.pull_request.html_url }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}