Fix CI: Explicitly use repository NuGet.config during restore

.github/workflows/build.yml

@@ -18,13 +18,29 @@ jobs:
         with:
           dotnet-version: 10.0.x
 
+      - name: Restore NuGet packages (use repo NuGet.config)
+        run: dotnet restore TechStacks.sln --configfile ./NuGet.Config
+
+      # If your feed requires authentication, enable and configure the step below.
+      # This example uses a Personal Access Token stored in secrets.NUGET_API_KEY.
+      # Alternatively, you can use the NuGet Authenticate action from Azure Pipelines.
+      # - name: Authenticate private NuGet feed
+      #   env:
+      #     NUGET_API_KEY: ${{ secrets.NUGET_API_KEY }}
+      #   run: |
+      #     dotnet nuget add source "https://YOUR_FEED_URL/index.json" \
+      #       --name "PrivateFeed" \
+      #       --username "YOUR_USERNAME" \
+      #       --password "$NUGET_API_KEY" \
+      #       --store-password-in-clear-text
+
       - name: build
-        run: dotnet build --configfile NuGet.Config
+        run: dotnet build --no-restore
         working-directory: .
 
       # - name: test
       #   run: |
-      #     dotnet test
+      #     dotnet test --no-restore
       #     if [ $? -eq 0 ]; then
       #       echo TESTS PASSED
       #     else