Update copilot-setup-steps.yml

Author: nixel2007

.github/workflows/copilot-setup-steps.yml

@@ -24,4 +24,7 @@ jobs:
       - uses: actions/setup-dotnet@v4
         with:
           dotnet-version: '6.0.x'
+
+      - name: Add msbuild to PATH
+        uses: microsoft/setup-msbuild@v2