Added submodule pulling into build action

Author: Amsakan Bavan

.github/workflows/Build.yml

@@ -10,6 +10,11 @@ jobs:
       - name: Checkout Project
         uses: actions/[email protected]
 
+      - name: Checkout submodules
+        uses: textbook/git-checkout-submodule-action@master
+        with:
+          remote: true
+
       - name: Build Project
         uses: threeal/[email protected]
         with: