Update workflow settings

Author: sdmj76

.github/workflows/build.yml

@@ -28,10 +28,26 @@ jobs:
     strategy:
       matrix:
         configuration: [Release, Debug]
+        
+    if: github.event.pull_request.head.repo.full_name == github.repository
 
     steps:
-      - name: Checkout
+      - name: Setup SSH
+        run: |
+          mkdir -p ~/.ssh
+          echo "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/id_ed25519
+          chmod 600 ~/.ssh/id_ed25519
+          ssh-keyscan github.com >> ~/.ssh/known_hosts
+
+      - name: Checkout with submodules
         uses: actions/checkout@v5
+        with:
+          submodules: recursive
+
+      - name: Check submodule
+        run: |
+          ls -la
+          ls -la core
 
       - name: Cache Xcode DerivedData
         uses: actions/cache@v5