docs: workflow use submodules

.github/workflows/doxygen.yml

@@ -9,6 +9,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+        with:
+            submodules: recursive
       - name: Install Doxygen
         run: sudo apt-get update && sudo apt-get install -y doxygen
       - name: Build docs