Dockerfile

FROM ruby:2.7.2

RUN apt-get update -yqq
RUN apt-get install -yqq --no-install-recommends less vim postgresql-client rsync

# Install NodeJS, the default version for Debian 9 is NodeJS 4.8.x, which is not supported by Webpacker.
# RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
# RUN curl -sL https://deb.nodesource.com/setup_10.x | bash -
RUN curl -sL https://deb.nodesource.com/setup_12.x | bash -
RUN apt-get install -yqq nodejs
RUN npm install yarn -g

ARG rails_env="production"
ARG bundle_without="development:test"

ENV RAILS_ENV=${rails_env}
ENV BUNDLE_WITHOUT=${bundle_without}

ENV BUNDLER_VERSION=2.1.4
RUN gem install bundler -v 2.1.4

# COPY Gemfile* /usr/src/app/
COPY . /usr/src/app
WORKDIR /usr/src/app
RUN bundle install --jobs=4

# TODO: Document the specific scenario why this is necessary
# See https://nickjanetakis.com/blog/dealing-with-lock-files-when-using-ruby-node-and-elixir-with-docker
# RUN mkdir -p /tmp/generated
# RUN cp Gemfile.lock /tmp/generated

# COPY . /usr/src/app

RUN if [ "$RAILS_ENV" = "production" ]; \
then bundle exec rake assets:precompile; \
else yarn install; \
fi

# Make sure the generated files are owned by the original user so that when we copy them back,
# they will be synced back to the OS under the same user.
ARG uid=1000
ARG gid=1000
USER ${uid}:${gid}

# See https://nickjanetakis.com/blog/dealing-with-lock-files-when-using-ruby-node-and-elixir-with-docker
RUN mkdir -p /tmp/generated
RUN cp Gemfile.lock /tmp/generated
RUN cp yarn.lock /tmp/generated
RUN cp -Rp node_modules /tmp/generated

USER root:root

ENTRYPOINT ["/usr/src/app/docker-container-entry.sh"]
# CMD ["unicorn", "-c", "./config/unicorn.rb"]