anchor.diff:  ENV LC_ALL C.UTF-8
   
   USER root
  +RUN groupadd -r ned -g 1000 && \
  +    useradd -u 1000 -r -g ned -m -s /sbin/nologin -c "Docker image user" ned && \
  +    mkdir /home/ned/bin && \
  +    mkdir /home/ned/src && \
  +    chown -R ned:ned /home/ned
  +
  +WORKDIR /home/ned/src
   
   # Update Ubuntu Software repository && update deps
   RUN apt-get update && \
  
positive.code: RUN rbenv install $ruby_version && \
      rbenv global $ruby_version
  
  ENTRYPOINT ["docker/entrypoint"]
  
negative.code:      libreadline-dev \
       ragel && \
       rm -rf /var/lib/apt/lists/*
  
  USER ned
  
  