# This is the "base image" which contains Alpine Linux and Node.js v10.x.x preinstalled
FROM mhart/alpine-node:10

# Use the `NPM_TOKEN` build arg to create the `~/.npmrc` file
ARG NPM_TOKEN
RUN echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" > ~/.npmrc

# Set the working direcrory to `/usr/src`
WORKDIR /usr/src

# Copy the package.json and yarn.lock files into the iamge and run `yarn` to install dependencies
COPY package.json yarn.lock /usr/src/
RUN yarn

# Copy the remaining source files into the image
COPY . .

# At this point the build is "done". CMD specifies the command that will be executed for runtime
CMD ["node", "start.js"]