anchor.diff:  ARG USER=user
   ARG UID=1000
   ARG GID=100
  +ARG TINI=v0.18.0
   
   # Update path with toolchains
   ENV PATH=${PATH}:/opt/bin
  
positive.code: ENV WORK                ${HOME}/work
  ENV                     TERM="xterm-color"
  
  # Create user, enable X forwarding, add to group dialout
  # -e DISPLAY=$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix
  RUN useradd -m -s /bin/bash -N -u $UID $USER && \
  
negative.code: 
  USER root
  
  ENTRYPOINT ["/sbin/tini", "--", "entrypoint.sh"]
  CMD ["bash"]
  
  COPY entrypoint.sh /usr/local/bin/
  COPY h2spec /usr/local/bin/
  COPY coap-client /usr/local/bin/
  