docker multi stage build with not-root user permissions set

Dockerfile example - multi-stage build

##############################################################
# This file is intended to be used with ./docker-compose.yml #
##############################################################

FROM node:10.14.1-alpine as build
# working directory
WORKDIR /usr/src/app

# global environment setup : yarn + dependencies needed to support node-gyp
RUN apk --no-cache --virtual add \
    python \
    make \
    g++ \
    yarn 

# copy just the dependency files and configs needed for install
COPY packages/peregrine/package.json ./packages/peregrine/package.json
COPY packages/pwa-buildpack/package.json ./packages/pwa-buildpack/package.json
COPY packages/upward-js/package.json ./packages/upward-js/package.json
COPY packages/upward-spec/package.json ./packages/upward-spec/package.json
COPY packages/venia-concept/package.json ./packages/venia-concept/package.json
COPY package.json yarn.lock babel.config.js browserslist.js ./

# install dependencies with yarn
RUN yarn install

# copy over the rest of the package files
COPY packages ./packages

# copy .env.docker file to .env
COPY ./docker/.env.docker ./packages/venia-concept/.env

# build the app
RUN yarn run build 


# MULTI-STAGE BUILD
FROM node:10.14.1-alpine
# working directory
WORKDIR /usr/src/app
# copy build from previous stage
COPY --from=build /usr/src/app .
# create and set non-root USER
RUN addgroup -g 1001 appuser && \
    adduser -S -u 1001 -G appuser appuser
RUN chown -R appuser:appuser /usr/src/app && \
    chmod 755 /usr/src/app
USER appuser

# command to run application
CMD [ "yarn", "workspace", "@magento/venia-concept", "run", "watch:docker"]