anchor.diff:  
   FROM alpine:${RUNTIME_ALPINE_VERSION} AS runtime-alpine
   FROM debian:${RUNTIME_DEBIAN_VERSION} AS runtime-debian
  +FROM centos:${RUNTIME_CENTOS_VERSION} AS runtime-centos
   FROM runtime-${DISTRO} AS runtime
   COPY docker-compose-entrypoint.sh /usr/local/bin/
   ENTRYPOINT ["sh", "/usr/local/bin/docker-compose-entrypoint.sh"]
  
positive.code:     openssl \
      zlib1g-dev
  
  FROM build-${DISTRO} AS build
  ENTRYPOINT ["sh", "/usr/local/bin/docker-compose-entrypoint.sh"]
  WORKDIR /code/
  
negative.code: ARG DOCKER_VERSION=19.03.8
  ARG PYTHON_VERSION=3.7.7
  ARG BUILD_ALPINE_VERSION=3.11
  ARG BUILD_CENTOS_VERSION=7
  ARG BUILD_DEBIAN_VERSION=slim-stretch
  ARG RUNTIME_ALPINE_VERSION=3.11.5
  ARG RUNTIME_CENTOS_VERSION=7
  ARG RUNTIME_DEBIAN_VERSION=stretch-20200414-slim
  
  ARG DISTRO=alpine
  