chore: fixed working directory for .NET build

.github/workflows/build.yml

@@ -1,4 +1,4 @@
-name: Build project with Maven
+name: Build project
 on:
   workflow_dispatch:
   pull_request:
@@ -44,5 +44,7 @@ jobs:
         dotnet-version: 8.x
     - name: Build
       run: dotnet build --configuration Release
+      working-directory: connector-csharp
     - name: Test
       run: dotnet test --configuration Release --no-build    
+      working-directory: connector-csharp