Added build step for frontend in NuGet publishing workflow to ensure class list files generate properly

.gitea/workflows/publish-nuget.yml

@@ -32,6 +32,10 @@ jobs:
         run: rm -rf ./artifacts
       
       # Publish frontend
+      # We need to build it first so the class list files generate
+      - name: Build project
+        run: dotnet build Moonlight.Frontend --configuration Debug
+      
       - name: Build tailwind styles and extract class list
         working-directory: Hosts/Moonlight.Frontend.Host/Styles
         run: npm install && npm run build