anchor.diff:  FROM ruby:2.3.3
  +
  +# Set time zone
  +ENV TZ=Europe/Berlin
  +
  +# Save timestamp of image building
  +RUN date -u > BUILD_TIME
   
   # Install MySQL client
   # Source: http://dev.mysql.com/doc/mysql-apt-repo-quick-guide/en/#repo-qg-apt-repo-manual-setup
  
positive.code: # Precompile assets
  RUN RAILS_ENV=production bundle exec rake assets:precompile --trace
  
  # Save timestamp of image building
  RUN date -u > BUILD_TIME
  
  # Start up
  CMD "docker/startup.sh"
  
negative.code: # Source: https://github.com/nginxinc/docker-nginx/blob/master/stable/jessie/Dockerfile
  ENV NGINX_VERSION 1.10.2-1~jessie
  RUN apt-key adv --keyserver hkp://pgp.mit.edu:80 --recv-keys 573BFD6B3D8FBC641079A6ABABF5BD827BD9BF62 \
    && echo "deb http://nginx.org/packages/debian/ jessie nginx" >> /etc/apt/sources.list \
    && apt-get update \
    && apt-get install --no-install-recommends --no-install-suggests -y \
              ca-certificates \
              nginx=${NGINX_VERSION} \
              nginx-module-xslt \
              nginx-module-geoip \
              nginx-module-image-filter \
              nginx-module-perl \
              nginx-module-njs \
              gettext-base \
    && rm -rf /var/lib/apt/lists/*
  
  # Add the nginx site and config
  RUN rm -rf /etc/nginx/sites-available/default
  ADD docker/nginx.conf /etc/nginx/nginx.conf
  EXPOSE 80 443
  
  ## Install Node.js
  # Source: https://github.com/nodejs/docker-node/blob/master/6.9/wheezy/Dockerfile
  