How to change permission for node user on a dockerized NodeJS app

Dockerfile

FROM node:12.2-alpine

ENV NODE_ENV=production

WORKDIR /node
COPY package.json yarn.lock ./
RUN mkdir app && chown -R node:node .
USER node
RUN yarn install && yarn cache clean --force

WORKDIR /node/app
COPY --chown=node:node . .

EXPOSE 3000

CMD ["node", "app.js"]