name: Write changelog for dependabot PR
on:
  pull_request:
    types:
      - opened

jobs:
  add-changelog:
    runs-on: 'ubuntu-latest'
    if: ${{ github.actor == 'dependabot[bot]' }}
    steps:
      - uses: actions/checkout@v3
        with:
          ref: ${{ github.event.pull_request.head.ref }}
      - name: Write, commit and push changelog
        run: |
          echo "${{ github.event.pull_request.title }}." > "changelog.d/${{ github.event.pull_request.number }}".docker
          git add changelog.d
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git config user.name "GitHub Actions"
          git commit -m "Changelog"
          git push
        shell: bash