ci(release): update release workflow to use clean changelog

- Replace multiline changelog output with clean_changelog
- Simplify changelog addition to RELEASE_CHANGELOG environment variable

Signed-off-by: diverger <[email protected]>

Author: diverger

.github/workflows/release.yml

@@ -117,9 +117,8 @@ jobs:
           echo "RELEASE_VERSION=${{ steps.bump_version.outputs.version }}" >> $GITHUB_ENV
           echo "RELEASE_TAG=${{ steps.bump_version.outputs.tag }}" >> $GITHUB_ENV
           echo "RELEASE_CHANGELOG<<EOF" >> $GITHUB_ENV
-          cat << 'CHANGELOG_EOF' >> $GITHUB_ENV
-          ${{ steps.bump_version.outputs.changelog }}
-          CHANGELOG_EOF
+          echo "${{ steps.bump_version.outputs.clean_changelog }}" >> $GITHUB_ENV
+          echo "EOF" >> $GITHUB_ENV
 
       # - name: 🏗️ Create empty release or modify a release existed
       #   id: create_release