update dotnet.yml

Author: SlimeNull

.github/workflows/dotnet.yml

@@ -30,7 +30,7 @@ jobs:
           7.0.x
 
     - name: Build
-      run: dotnet build
+      run: dotnet build -c Release
       working-directory: src
     - name: Test
       run: dotnet test --no-build --verbosity normal