added path to build files

Author: Petr Sramek

.github/workflows/dotnet.yml

@@ -27,7 +27,9 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: build
-        path: .
+        path: |
+          **/bin/*
+          **/obj/*
 
   test:
     needs: [build]