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FROM ruby:2.7-slim-buster

WORKDIR /rails_app

RUN apt-get update && apt-get -y upgrade && \
    apt-get install --no-install-recommends -y \
      build-essential \
      # git is required for installing gems from git repos
      git \
      libpq-dev \
      # debian buster and comes with pg client v11 by default
      postgresql-client-11 \
      tmpreaper

# set MRI memory allocator to mimic jemalloc memory savings
ENV MALLOC_ARENA_MAX=2

ADD ./Gemfile /rails_app/
ADD ./Gemfile.lock /rails_app/

RUN bundle config --global jobs `cat /proc/cpuinfo | grep processor | wc -l | xargs -I % expr % - 1`

# run `gem update system` so installation of mini_racer does not fail
# See troubleshooting for mini_racer and supported ruby versions: https://github.com/rubyjs/mini_racer?tab=readme-ov-file#supported-ruby-versions--troubleshooting
# pinning gem update to 3.4.22 since anything higher requires updating Ruby version to 3+
RUN gem i "rubygems-update:~>3.4.22" --no-document && update_rubygems
RUN bundle install

ADD ./ /rails_app

RUN (cd /rails_app && mkdir -p tmp/pids && rm -f tmp/pids/*.pid)

CMD ["/rails_app/scripts/docker/start.sh"]