Update Cake build target in main.yml from Default to Build

Author: epidemicz

.github/workflows/main.yml

@@ -33,4 +33,4 @@ jobs:
         run: dotnet tool install --global Cake.Tool && dotnet tool restore
 
       - name: Run Cake build
-        run: dotnet cake --target=Default
+        run: dotnet cake --target=Build