Try to release source package on github automatically

.github/workflows/release.yml

@@ -187,6 +187,12 @@ jobs:
         path: source.tar.gz
         retention-days: 1
 
+    - name: Release on GitHub
+      uses: softprops/action-gh-release@v0.1.13
+      if: startsWith(github.ref, 'refs/tags/')
+      with:
+        files: build/bundles/citymania-client-${{ steps.metadata.outputs.version }}-source.zip
+
   docs:
     name: Docs
     needs: source