Dockerfile
FROM ruby:2.5
WORKDIR /pg_web_stats
ENV RACK_ENV=production
COPY Gemfile Gemfile.lock pg_web_stats.gemspec /pg_web_stats/
RUN bundle install
COPY . /pg_web_stats/
RUN mkdir /etc/pg_web_stats \
&& ln -sf /etc/pg_web_stats/config.yml /pg_web_stats/config.yml
EXPOSE 9292
CMD ["bundle", "exec", "rackup", "--host", "0.0.0.0", "--port", "9292"]