removed submodule checkout and moved it to checkout action

.github/workflows/docker.yml

@@ -32,14 +32,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           fetch-depth: 0
-      # And any submodules
-      - name: Checkout submodules
-        shell: bash
-        run: |
-          git config --global url."https://github.com/".insteadOf "git@github.com:"
-          auth_header="$(git config --local --get http.https://github.com/.extraheader)"
-          git submodule sync --recursive
-          git -c "http.extraheader=$auth_header" -c protocol.version=2 submodule update --init --force --recursive --depth=1
+          submodules: true
         # Fetch all tags
       - name: Fetch tags
         run: git fetch --tags