anchor.diff:  
   ARG BUILD_DATE
   ARG VCS_REF
  -ARG DOCKER_ENGINE=18.09.1-r0
  -ARG DOCKER_MACHINE=0.16.1
   ARG START_TIMEOUT=300000
   
   LABEL \
  
positive.code:     curl \
      git \
      openssh \
      gcc \
      musl-dev \
      openssl \
      docker@community=${DOCKER_ENGINE_VERSION} \
      py2-pip && \
      wget -q https://github.com/docker/machine/releases/download/v${DOCKER_MACHINE_VERSION}/docker-machine-Linux-x86_64 -O /usr/bin/docker-machine && \
      chmod +x /usr/bin/docker-machine && \
      chmod g+x /etc && \
      pip install --upgrade pip && \
      pip install docker-compose && \
  
negative.code:     org.label-schema.vcs-ref=${VCS_REF} \
      nl.timmertech.license=MIT
  
  ENV GITLAB_RUNNER_DATA=/data \
      S6_KILL_FINISH_MAXTIME=${START_TIMEOUT}
  
  RUN echo 'http://nl.alpinelinux.org/alpine/edge/community'  >> /etc/apk/repositories && \
      apk upgrade --update --no-cache && \
      apk add --no-cache --update --virtual libs \
      build-base \
      musl-dev \
      libffi-dev \
      python3-dev \
      openssl-dev && \
      apk add --no-cache --update \
      bash \
      ca-certificates \
  