Dockerfile

ARG RUBY_VERSION
FROM ruby:$RUBY_VERSION

ARG PG_MAJOR
ARG NODE_MAJOR
ARG BUNDLER_VERSION
ARG YARN_VERSION
ARG RAILS_ENV

ENV RAILS_ENV=${RAILS_ENV} \
  SECRET_KEY_BASE=foo \
  RAILS_SERVE_STATIC_FILES=true \
  RAILS_LOG_TO_STDOUT=true

WORKDIR /app

# Add PostgreSQL to sources list
RUN curl -sSL https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - \
  && echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' $PG_MAJOR > /etc/apt/sources.list.d/pgdg.list

# Add NodeJS to sources list
RUN curl -sL https://deb.nodesource.com/setup_$NODE_MAJOR.x | bash -

# Add Yarn to the sources list
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
  && echo 'deb http://dl.yarnpkg.com/debian/ stable main' > /etc/apt/sources.list.d/yarn.list

COPY .docker/Aptfile /tmp/Aptfile
RUN apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get -yq dist-upgrade && \
  DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
    build-essential \
    postgresql-client-$PG_MAJOR \
    netcat \
    nodejs \
    yarn=$YARN_VERSION-1 \
    $(cat /tmp/Aptfile | xargs) && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \
    truncate -s 0 /var/log/*log
ENV NOKOGIRI_USE_SYSTEM_LIBRARIES 1

# Configure bundler and PATH
ENV LANG=C.UTF-8 \
  BUNDLE_JOBS=4 \
  BUNDLE_RETRY=3

# Install gems
ADD Gemfile* /app/
RUN gem update --system && \
    gem install bundler:$BUNDLER_VERSION

RUN bundle config --global frozen 1 \
 && bundle install --binstubs -j4 --retry 3

# Install yarn packages
COPY package.json yarn.lock /app/
RUN yarn install

# Add the Rails app
ADD . /app

WORKDIR /app

EXPOSE 3000

RUN date -u > BUILD_TIME

# Start up
# CMD [".docker/startup.sh"]