fix: docker镜像修复

frontend/Dockerfile

@@ -20,11 +20,17 @@ RUN npm run build
 FROM nginx:stable-alpine as production-stage
 
 # 复制自定义nginx配置（如需要）
-COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY nginx.conf /etc/nginx/conf.d/default.conf.template
 
 # 从构建阶段复制构建结果到nginx服务目录
 COPY --from=build-stage /app/dist /usr/share/nginx/html
 
+# 创建启动脚本
+RUN echo '#!/bin/sh \n\
+envsubst "\$BACKEND_URL" < /etc/nginx/conf.d/default.conf.template > /etc/nginx/conf.d/default.conf \n\
+nginx -g "daemon off;"' > /docker-entrypoint.sh && \
+chmod +x /docker-entrypoint.sh
+
 # 暴露80端口
 EXPOSE 80
 
@@ -32,5 +38,5 @@ EXPOSE 80
 HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
   CMD wget --quiet --tries=1 --spider http://localhost:80 || exit 1
 
-# 设定Nginx是否以守护进程的方式启动
-CMD ["nginx", "-g", "daemon off;"] 
+# 设定启动命令
+CMD ["/docker-entrypoint.sh"]