name: Auto approve PR

on:
  pull_request_target:
    types: [opened, reopened, synchronize]

permissions:
  pull-requests: write

jobs:
  # Auto approve on dependabot PR at patch update
  #   by https://zenn.dev/nemuki/articles/dependabot-auto-merge
  approve-updating-patch-version:
    runs-on: ubuntu-latest
    if: ${{ github.actor == 'dependabot[bot]' }}
    steps:
      - name: Dependabot metadata
        id: dependabot-metadata
        uses: dependabot/fetch-metadata@v2
        with:
          github-token: '${{ secrets.GITHUB_TOKEN }}'
      - name: Approve a PR
        if: ${{ steps.dependabot-metadata.outputs.update-type == 'version-update:semver-minor' || steps.dependabot-metadata.outputs.update-type == 'version-update:semver-patch' }}
        run: gh pr review --approve "$PR_URL"
        env:
          PR_URL: ${{ github.event.pull_request.html_url }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}