ci: revert docker file to production env

Dockerfile

@@ -6,15 +6,13 @@ COPY package.json yarn.lock ./
 COPY lerna.json .babelrc .eslintignore .eslintrc .prettierrc .stylelintignore .stylelintrc ./
 COPY packages packages
 
-ENV NODE_ENV "development"
-
 RUN [ "yarn", "config", "set", "workspaces-experimental", "true" ]
 
 RUN [ "yarn", "install", "--frozen-lockfile" ]
 RUN [ "yarn", "cache", "clean"]
 RUN [ "rm", "-rf", "/npm-packages-offline-cache"]
 
-ENV NODE_ENV ${NODE_ENV}
+ENV NODE_ENV "production"
 
 WORKDIR ${HOME}/packages/xpub-faraday