only run unit test on release

Author: dangell7

.github/workflows/nuget.release.yml

@@ -25,7 +25,7 @@ jobs:
       run: dotnet build --no-restore
 
     - name: Test
-      run: dotnet test --no-build --verbosity normal
+      run: dotnet test --no-build --verbosity normal --filter "TestU"
 
     - name: Packing
       run: |