Dockerfile for rails in prod

Dockerfile.prod

# ---------------------------------------------------------------------------
# This is the Dockerfile to build the prod app image
# ---------------------------------------------------------------------------
FROM 10.150.0.21:5000/base_images/rails:latest

MAINTAINER XXX

ENV REFRESHED_AT 2015-08-07
ENV HOME /app

WORKDIR /tmp

ADD Gemfile Gemfile
ADD Gemfile.lock Gemfile.lock
RUN gem install bundler
RUN bundle install -j4 --without development test --retry 3

ADD . /app

WORKDIR /app

RUN rm -rf /tmp/*

EXPOSE 5000

CMD ["bundle", "exec", "foreman", "start"]