anchor.diff:  # Ruby
   #############
   
  -FROM ubuntu:bionic as ruby_tools_context
  +FROM ubuntu:xenial as ruby_tools_context
   
   # Pinned versions of stuff we pull in
   ENV AWESOMEBOT_VERSION=1.19.1
  
positive.code: # Base OS
  #############
  
  FROM ubuntu:bionic as base_os_context
  
  ENV DOCKER_VERSION=5:19.03.2~3-0~ubuntu-bionic
  ENV CONTAINERD_VERSION=1.2.6-3
  
  ENV OUTDIR=/out
  
negative.code: # Docker including docker-ce, docker-ce-cli, and containerd.io
  ADD https://download.docker.com/linux/ubuntu/gpg /tmp/docker-key
  RUN apt-key add /tmp/docker-key
  RUN add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable"
  RUN apt-get update
  RUN apt-get -y install --no-install-recommends docker-ce="${DOCKER_VERSION}" docker-ce-cli="${DOCKER_VERSION}" containerd.io="${CONTAINERD_VERSION}"
  
  