Update publish_release.yml

Author: wonderslug

.github/workflows/publish_release.yml

@@ -30,7 +30,7 @@ jobs:
         with:
           github_token: ${{ github.token }}
           source_ref: ref/tags/${{ env.RELEASE_VERSION }}
-          target_branch: 'main'
+          target_branch: refs/heads/main
           commit_message_template: '[Automated] Merged {source_ref} into target {target_branch}'
       - name: Push to GitHub Packages
         uses: docker/build-push-action@v2.3.0