FROM ruby:2.5 RUN apt-get update -qq && apt-get install -y nodejs postgresql-client RUN mkdir /app WORKDIR /app COPY Gemfile /app/Gemfile COPY Gemfile.lock /app/Gemfile.lock RUN bundle install COPY . /app # Add a script to be executed every time the container starts. COPY entrypoint.sh /usr/bin/ RUN chmod +x /usr/bin/entrypoint.sh ENTRYPOINT ["entrypoint.sh"] EXPOSE 3000 # Start the main process. CMD ["rails", "server", "-b", "0.0.0.0"]