dotnet(msbuild): build in release (#6472)

Author: bruno-garcia

src/platforms/dotnet/common/configuration/msbuild.mdx

@@ -41,7 +41,7 @@ However, we generally recommend the following:
   ```yaml
   steps:
   - name: Build
-    run: dotnet build
+    run: dotnet build -c Release
     env:
       SENTRY_AUTH_TOKEN: ${{ secrets.SENTRY_AUTH_TOKEN }}
   ```