Update release-workflow.yaml

Added the changelog.md function,  checks if it exists, if not, make it, and appends changes

.github/workflows/release-workflow.yaml

@@ -193,3 +193,38 @@ jobs:
           tar -tvf nextcloud-release.tar.gz
           echo "info.xml contents:"
           tar -xOf nextcloud-release.tar.gz ${{ env.APP_NAME }}/appinfo/info.xml
+
+      - name: Update CHANGELOG.md
+        run: |
+          if [ ! -f CHANGELOG.md ]; then
+            echo "# Changelog" > CHANGELOG.md
+            echo "" >> CHANGELOG.md
+            echo "## [Unreleased]" >> CHANGELOG.md
+            echo "### Added" >> CHANGELOG.md
+            echo "- Initial release" >> CHANGELOG.md
+            echo "" >> CHANGELOG.md
+          fi
+          
+          # Create a new entry for the current version
+          NEW_ENTRY="## ${{ env.NEW_VERSION }} – $(date +'%Y-%m-%d')"
+          echo "$NEW_ENTRY" > temp_changelog.md
+          echo "### Added" >> temp_changelog.md
+          echo "- New features for this release" >> temp_changelog.md
+          echo "" >> temp_changelog.md
+          echo "### Changed" >> temp_changelog.md
+          echo "- Changes in existing functionality for this release" >> temp_changelog.md
+          echo "" >> temp_changelog.md
+          echo "### Fixed" >> temp_changelog.md
+          echo "- Bug fixes for this release" >> temp_changelog.md
+          echo "" >> temp_changelog.md
+          
+          # Append the new entry after the Unreleased section
+          sed -i '/## \[Unreleased\]/,/^$/!b;:a;/^$/!{$!{N;ba}};/\n.*/{P;D}' CHANGELOG.md
+          sed -i '/## \[Unreleased\]/r temp_changelog.md' CHANGELOG.md
+          rm temp_changelog.md
+          
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Action"
+          git add CHANGELOG.md
+          git commit -m "Update CHANGELOG.md for version ${{ env.NEW_VERSION }}" || echo "No changes to commit"
+          git push