ci(unionpd): build unionpd-image

Author: cor

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     secrets:
       nixbuild_token: ${{ secrets.nixbuild_token }}
     with:
-      filter_builds: '(.top_attr == "packages") and (.system == "x86_64-linux" or .system == "aarch64-linux") and (.attr == "uniond" or .attr == "unionpd" or .attr == "uniond-image")' # ensure to append this list if you want to release more artifacts
+      filter_builds: '(.top_attr == "packages") and (.system == "x86_64-linux" or .system == "aarch64-linux") and (.attr == "uniond" or .attr == "unionpd" or .attr == "uniond-image" or .attr == "unionpd-image")' # ensure to append this list if you want to release more artifacts
 
   download-docker-images:
     runs-on: ubuntu-latest