Dockerfile

# Use the official Ruby image because the Rails images have been deprecated
FROM ruby:2.5

# Install packages of https
RUN apt-get update && apt-get install apt-transport-https

# npm and yarn is needed by webpacker to install packages
# TOOD(sbc): Create a separate production container without this.
RUN mkdir /usr/local/node \
    && curl -L https://nodejs.org/dist/v8.9.4/node-v8.9.4-linux-x64.tar.xz | tar Jx -C /usr/local/node --strip-components=1

RUN apt-get update \
    && apt-get install -y --no-install-recommends postgresql-client \
    && rm -rf /var/lib/apt/lists/*

RUN ln -s ../node/bin/node /usr/local/bin/
RUN ln -s ../node/bin/npm /usr/local/bin/

ADD https://dl.yarnpkg.com/debian/pubkey.gpg /tmp/yarn-pubkey.gpg
RUN apt-key add /tmp/yarn-pubkey.gpg && rm /tmp/yarn-pubkey.gpg
RUN echo 'deb http://dl.yarnpkg.com/debian/ stable main' > /etc/apt/sources.list.d/yarn.list
RUN apt-get update && apt-get install -y --no-install-recommends yarn

RUN \
  groupadd --gid 999 appuser && \
  useradd --system --create-home --uid 999 --gid appuser appuser
USER appuser

WORKDIR /upaya

COPY package.json /upaya
COPY yarn.lock /upaya

COPY Gemfile /upaya
COPY Gemfile.lock /upaya

RUN gem install bundler --conservative
RUN bundle check || bundle install --without deploy production

COPY . /upaya

EXPOSE 3000
CMD ["rackup", "config.ru", "--host", "0.0.0.0", "--port", "3000"]