message: work on nginx
diff: -FROM node:12
  +FROM node:12 as builder
  WORKDIR /app
  COPY package.json yarn.lock .yarnrc .npmrc /app/
  @@ -12,6 +12,6 @@ COPY . .
  RUN yarn build
  -EXPOSE 3000
  +FROM nginx:mainline
  -CMD ["yarn", "workspace", "@spotify-backstage/app", "start"]
  +COPY --from=builder /app/packages/app/build /usr/share/nginx/html
  