ci: update worflows config.

Author: jaywcjlove

.github/workflows/ci.yml

@@ -66,6 +66,7 @@ jobs:
 
       - run: npm install idoc@1 -g
       - run: idoc
+      - run: cp -rp assets/social-preview.png dist/assets/
 
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v4