anchor.diff:  RUN rbenv install $ruby_version && \
       rbenv global $ruby_version
   
  +COPY --chown=ned:ned . /home/ned/src
  +
   ENTRYPOINT ["docker/entrypoint"]
  
positive.code:      libreadline-dev \
       ragel && \
       rm -rf /var/lib/apt/lists/*
  
  RUN groupadd -r ned -g 1000 && \
      useradd -u 1000 -r -g ned -m -s /sbin/nologin -c "Docker image user" ned && \
      chown -R ned:ned /home/ned
  
  WORKDIR /home/ned/app
  
  USER ned
  
  
negative.code: 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 && \
  