Dockerfile

FROM alpine

# Internal unprivileged user will have this ID:
ENV CONTAINER_USER_ID="1000" \
    CONTAINER_GROUP_ID="1000"

# Updates S.O. and adds system required packages
RUN apk update && apk upgrade
RUN apk add nodejs python make g++ git

# creates unprivileged user "user"
RUN adduser -D -u ${CONTAINER_USER_ID} -g ${CONTAINER_GROUP_ID} -h /home/user -s /bin/sh user

# Global npm folder writeable by "user"
RUN mkdir -p /opt/npm-global && \
    chown user:user /opt/npm-global

# After this point everything is done as unpriveleged user
USER user

# configures environment
ENV NPM_CONFIG_PREFIX=/opt/npm-global
ENV PATH=$NPM_CONFIG_PREFIX/bin:$PATH

# Install usefull npm packages
RUN npm install -g \
    npm \
    angular-cli

WORKDIR /home/user/src
VOLUME /home/user/src

# Copy entrypoint script (should be an executable) into the container
COPY ./entrypoint.sh /entrypoint.sh

# Copy everything (except what is in .dockerignore) to the workdir, inside the container
COPY ./ . 

# COPY always set root as the owner, so let's change it all to user
USER root
RUN chown -R user:user .
USER user

EXPOSE 4200 49153
ENTRYPOINT ["/entrypoint.sh"]
CMD ["default"]  # default is defined in entrypoint.sh