Fix dotnet test command syntax for --solution flag

Author: niemyjski

.github/workflows/build.yml

@@ -42,5 +42,5 @@ jobs:
     - name: Run Tests with Timeout
       run: |
         echo "Starting tests with 10 minute timeout..."
-        dotnet test Foundatio.AWS.slnx --configuration Release --no-build --timeout 10m --verbosity detailed 2>&1 || true
+        dotnet test --solution Foundatio.AWS.slnx --configuration Release --no-build --timeout 10m --verbosity detailed 2>&1 || true
       timeout-minutes: 12