更新 Dockerfile

Dockerfile

 FROM  registry.cn-beijing.aliyuncs.com/qianjia_public/mygitbook as build-stage
 WORKDIR /app
 COPY *  ./
-RUN gitbook install && gitbook build 
+RUN gitbook init && gitbook install && gitbook build 
 
 FROM registry-vpc.cn-beijing.aliyuncs.com/qianjia2018/qianjia_public:dist-nginx as production-stage
 COPY --from=build-stage /app/_book /usr/share/nginx/html