anchor.diff:      rm -rf /var/lib/apt/lists/* && rm -fr *Release* *Sources* *Packages* && \
       truncate -s 0 /var/log/*log
   
  -# SSH proxy settings
  -ENV SSH_AUTH_SOCK /tmp/ssh-auth
  -ENV SSH_AUTH_PROXY_PORT 1234
  -
   RUN mkdir -p /usr/src/app
   RUN bundle config --global without test:development
   WORKDIR /usr/src/app
  
positive.code: FROM ruby:2.2
  
  # install socat to proxy SSH traffic for private repos
  RUN apt-get update && apt-get install -y socat apt-transport-https && \
      apt-get clean && \
      rm -rf /var/lib/apt/lists/* && rm -fr *Release* *Sources* *Packages* && \
      truncate -s 0 /var/log/*log
  
negative.code: RUN echo ':verbose: true' > $HOME/.gemrc && echo 'install: --no-document' >> $HOME/.gemrc && echo 'update: --no-document' >> $HOME/.gemrc
  
  # Hack to install private gems
  RUN bundle install
  
  COPY . /usr/src/app
  RUN mkdir -p /usr/src/app/public/assets
  