build(image): update dockerfile

Author: a632079

Dockerfile

@@ -2,7 +2,7 @@ FROM node:14
 ENV NODE_ENV production
 WORKDIR /usr/src/app
 COPY ["package.json", "yarn.lock", "./"]
-RUN yarn && mv node_modules ../
+RUN yarn --prod && mv node_modules ../
 COPY . .
 VOLUME [ "./data" ]
 COPY "config.example.json" "./data"