Add submodule support to Build.yml

Enable submodule checkout in GitHub Actions workflow.

Author: Trollhunters501

.github/workflows/Build.yml

@@ -8,6 +8,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true  
 
       - name: Set up JDK 17
         uses: actions/setup-java@v5