update_changelog.yml

name: Update Changelog file

on:
  workflow_dispatch:
  release:
    types: [published]

jobs:
  update-changelog:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2
        
      - name: Get latest release tag
        id: get_latest_release
        run: echo "::set-output name=tag::$(gh release list -R ${{ github.repository }} --limit 1 --json tagName --jq '.[0].tagName')"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: Get release notes
        id: get_release_notes
        run: |
          release_notes=$(gh release view ${{ steps.get_latest_release.outputs.tag }} -R ${{ github.repository }} --json body --jq '.body')
          echo "::set-output name=notes::$release_notes"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Update CHANGELOG.md
        run: |
          echo "## [${{ steps.get_latest_release.outputs.tag }}] - $(date +"%Y-%m-%d")" >> CHANGELOG.md
          echo "${{ steps.get_release_notes.outputs.notes }}" >> CHANGELOG.md
          echo "" >> CHANGELOG.md

      - name: Create new branch
        run: |
          git checkout -b update-changelog-${{ steps.get_latest_release.outputs.tag }}
          git add CHANGELOG.md
          git commit -m 'Update CHANGELOG.md for ${{ steps.get_latest_release.outputs.tag }}'
          git push -u origin update-changelog-${{ steps.get_latest_release.outputs.tag }}

      - name: Create Pull Request
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          gh pr create \
            --title "Update CHANGELOG.md for ${{ steps.get_latest_release.outputs.tag }}" \
            --body "This PR updates the CHANGELOG.md file with the release notes for ${{ steps.get_latest_release.outputs.tag }}." \
            --head update-changelog-${{ steps.get_latest_release.outputs.tag }} \
            --base main