Update Dockerfile

Dockerfile

@@ -39,7 +39,8 @@ RUN echo '#!/bin/bash\n\
           # 1. 启动 frpc (后台运行)\n\
           # /usr/local/bin/frpc -f ${FRP_TOKEN} &\n\
           # 2. 前台启动 code-server (保持容器运行)\n\
-          git remote set-url origin https://${GH_TOKEN}@github.com/${GH_USERNAME}/cpp_competition.git \n\
+          git remote set-url origin https://${GH_TOKEN}@github.com/${GH_USERNAME}/${HUB_NAME}.git \n\
+          git clone https://github.com/${GH_USERNAME}/${HUB_NAME}.git
           exec code-server /home/coder/cpp_competition' > /home/coder/start.sh
 RUN chmod +x /home/coder/start.sh