Checkout submodules in workflow

Author: Samir Boulema

.github/workflows/workflow.yml

@@ -15,7 +15,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
+        with:
+          submodules: true
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1