Initiate submodule before checking out branch

.github/workflows/kuksa-client.yml

@@ -138,6 +138,7 @@ jobs:
           python -m pip --quiet --no-input install --upgrade pip
       - name: Initiate submodules
         run: |
+          git submodule init
           git submodule update --recursive --remote
       - name: Install dependencies with pip
         run: |