Dockerfile

FROM node:12-alpine 

EXPOSE 8181

HEALTHCHECK --interval=17s --timeout=3s --start-period=5s \ 
    CMD node ./lib/healthcheck.js

# Create the work dir and set permissions as WORKDIR set the permissions as root
RUN mkdir /home/node/app/ && chown -R node:node /home/node/app

WORKDIR /home/node/app

COPY --chown=node:node package*.json ./

# set the context from now on to use the node user, which is created in the base image
USER node

RUN npm install --only=prod && npm cache clean --force --loglevel=error

# Copy app source
COPY --chown=node:node index.js .
COPY --chown=node:node lib ./lib/

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