Check out full submodule, not just one commit

Author: leaf-node

.github/workflows/flutter_build.yml

@@ -16,11 +16,11 @@ jobs:
     steps:
       - name: Clone repository
         uses: actions/checkout@v4
-        with:
-          submodules: true
       - run: |
           sudo apt-get update -y
           sudo apt-get install -y ninja-build libgtk-3-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
+      - run: git submodule init
+      - run: git submodule update
       - run: echo "$GITHUB_WORKSPACE/.flutter/bin/" >> "$GITHUB_PATH"
       - run: flutter --disable-analytics
       - run: flutter channel stable