anchor.diff:  
   ENV BUILD_PACKAGES bash curl-dev ruby-dev build-base
   ENV RUBY_PACKAGES ruby ruby-dev ruby-bigdecimal ruby-json ruby-io-console ruby-bundler
  +ENV REDIS_PACKAGES redis
   
   # Update and install all of the required packages.
   # At the end, remove the apk cache
  
positive.code: 
  EXPOSE 9292/tcp
  
  CMD bundle exec rackup config.ru -p 9292 --host 0.0.0.0
  
negative.code:     apk upgrade && \
      apk add $BUILD_PACKAGES && \
      apk add $RUBY_PACKAGES && \
      apk add $REDIS_PACKAGES && \
      rm -rf /var/cache/apk/*
  
  RUN mkdir /usr/faexport
  