Ruby 2.2.2 via rbenv

FROM ubuntu:14.04

RUN apt-get update && apt-get --force-yes -y --no-install-recommends upgrade
RUN apt-get install --force-yes -y --no-install-recommends  \
        mysql-client postgresql-client sqlite3 nodejs  curl git \
        build-essential libssl-dev ca-certificates libmysqlclient-dev \
        libxslt1-dev libxml2 libxml2-dev libpq-dev libevent-dev libreadline-dev \
    && rm -rf /var/lib/apt/lists/*

# Install rbenv and ruby-build
RUN git clone https://github.com/sstephenson/rbenv.git /root/.rbenv
RUN git clone https://github.com/sstephenson/ruby-build.git /root/.rbenv/plugins/ruby-build
RUN git clone https://github.com/sstephenson/rbenv-gem-rehash.git /root/.rbenv/plugins/rbenv-gem-rehash
ENV PATH /root/.rbenv/bin:$PATH
RUN echo 'eval "$(rbenv init -)"' >> /etc/profile.d/rbenv.sh # or /etc/profile
RUN echo 'eval "$(rbenv init -)"' >> ~/.bashrc

# Install a version of ruby
ENV INSTALL_RUBY_VERSION 2.2.2
RUN rbenv install $INSTALL_RUBY_VERSION

# Install Bundler for each version of ruby
RUN echo 'gem: --no-rdoc --no-ri' >> ~/.gemrc
RUN bash -l -c 'for v in $(rbenv versions --bare); do rbenv global $v; echo "Install bundler for ruby $v";gem install bundler; done'

WORKDIR /app

ADD Gemfile /app/Gemfile
ADD Gemfile.lock /app/Gemfile.lock
RUN bash -l -c "bundle install && rm -rf /app/Gemfile /app/Gemfile.lock"