anchor.diff:  
   # Install npm packages
   WORKDIR /home/app/webapp/vendor
  -RUN /sbin/setuser app npm install && \
  -    npm install -g phantomjs-prebuilt
  +RUN /sbin/setuser app npm install
   
   # Install Ruby gems
   WORKDIR /home/app/webapp
  
positive.code: # Use baseimage-docker's init process.
  CMD ["/sbin/my_init"]
  
  # Install Ruby 2.4.1
  RUN bash -lc 'rvm --default use ruby-2.4.1'
  
  # Update installed APT packages
  RUN apt-get update && apt-get upgrade -y -o Dpkg::Options::="--force-confold" && \
  
negative.code: FROM phusion/passenger-full:0.9.30
  MAINTAINER Martin Fenner "mfenner@datacite.org"
  
  # Set correct environment variables.
  