anchor.diff:  ENV PROTOTOOL_VERSION=7df3b957ffe3d09dc57fe4e1eb96694614db8c7a
   ENV SHELLCHECK_VERSION=v0.7.0
   ENV UPX_VERSION=3.95
  -ENV DOCKER_VERSION=18.06.1~ce~3-0
   ENV KIND_VERSION=v0.5.1
   
   WORKDIR /tmp
  
positive.code: ADD https://storage.googleapis.com/kubernetes-release/release/v${KUBECTL_VERSION}/bin/linux/amd64/kubectl ${OUTDIR}/usr/bin/kubectl
  RUN chmod 555 ${OUTDIR}/usr/bin/kubectl
  
  # Docker
  RUN curl -fsSL https://download.docker.com/linux/ubuntu/gpg >/tmp/dkey
  RUN apt-key add /tmp/dkey
  RUN add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable"
  RUN apt-get update && apt-get -qqy install --no-install-recommends docker-ce="${DOCKER_VERSION}~ubuntu"
  RUN mv /usr/bin/docker ${OUTDIR}/usr/bin
  
  # Cleanup stuff we don't need in the final image
  RUN rm -fr /usr/local/go/doc
  RUN rm -fr /usr/local/go/test
  
negative.code:     pkg-config \
      python3 \
      wget
  
  # 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}"
  
  # Clean up stuff we don't need in the final image
  RUN rm -rf /var/lib/apt/lists/*
  