ci: Add missing submodules: true to the actions/checkout step

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

.github/workflows/ci.yaml

@@ -117,6 +117,8 @@ jobs:
     steps:
       - name: Fetch sources
         uses: actions/checkout@v4
+        with:
+          submodules: true
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3