Checkout submodule in action

.gitea/workflows/publish.yml

@@ -12,6 +12,8 @@ jobs:
           tool: zola@0.19.1
       - name: Check out repository code
         uses: actions/checkout@v4
+        with:
+          submodules: 'true'
       - name: Build
         run: zola build
       - name: Upload