Update production workflow

.gitea/workflows/production.yml

@@ -12,8 +12,16 @@ jobs:
       image: node:22-bullseye
     steps:
       - uses: actions/checkout@v4
-        with:
-          submodules: true
+      - name: install ssh key
+        env:
+        run: |
+          install -m 600 -D /dev/null theme-deploy-key
+          echo "${{ secrets.THEME_DEPLOY_KEY }}" | base64 --decode > theme-deploy-key
+
+      - name: init submodules
+        env:
+          GIT_SSH_COMMAND: ssh -i theme-deploy-key -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no
+        run: git submodule update --init
 
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v3