Update Dockerfile

Dockerfile

@@ -11,7 +11,7 @@ RUN cnpm install --no-progress
 RUN npm run build
 # production stage
 # 使用nginx镜像
-FROM nginxstable-alpine as production-stage
+FROM nginx:stable-alpine as production-stage
 # 使用--from把上面产生的静态文件复制到nginx的运行目录
 COPY --from=build-stage appdist usrsharenginxhtml
 # nginx容器内部暴露的端口