update-changelog.yaml

# .github/workflows/update-changelog.yaml
name: "Update Changelog"

on:
  release:
    types: [released]

jobs:
  update:
    runs-on: ubuntu-latest

    permissions:
      # Give the default GITHUB_TOKEN write permission to commit and push the 
      # updated CHANGELOG back to the repository.
      # https://github.blog/changelog/2023-02-02-github-actions-updating-the-default-github_token-permissions-to-read-only/
      contents: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          ref: ${{ github.event.release.target_commitish }}

      - name: Update Changelog
        uses: stefanzweifel/changelog-updater-action@v1
        with:
          latest-version: ${{ github.event.release.tag_name }}
          release-notes: ${{ github.event.release.body }}

      - name: Commit updated CHANGELOG
        uses: stefanzweifel/git-auto-commit-action@v4
        with:
          create_branch: true
          branch: changelog-update-${{ github.event.release.tag_name }}
          commit_message: Update CHANGELOG
          file_pattern: CHANGELOG.md