do a local build in multi-stage

Dockerfile

@@ -1,7 +1,17 @@
+FROM node:8
+
+ENV NODE_ENV=production
+RUN yarn global add bower gulp
+
+RUN mkdir -p /app
+WORKDIR /app
+ADD . /app
+RUN yarn && yarn run build
+
 FROM nginx:alpine
 
 COPY nginx.conf /etc/nginx/nginx.conf
-COPY public /usr/share/nginx/html
+COPY --from=0 /app/public /usr/share/nginx/html
 
 EXPOSE 80
 CMD ["nginx", "-g", "daemon off;"]