chore: fix action to pull submodules

.gitea/workflows/ci.yml

@@ -8,8 +8,13 @@ jobs:
   build-and-test:
     runs-on: ubuntu-latest
     steps:
-      - name: Check out repository
+      - name: Check out repository (with submodules)
         uses: actions/checkout@v4
+        with:
+          # Ensure submodules (like external/angelscript and external/raylib) are checked out.
+          submodules: true
+          # Fetch full history so submodules can be cloned properly.
+          fetch-depth: 0
 
       - name: Install system dependencies
         run: |