anchor.diff:  WORKDIR /work
   RUN ./pkg/deb/build.sh
   
  -FROM centos:7 AS centos7
  +FROM centos:7 AS centos7-build
   
   RUN set -x; yum -y update && \
       yum -y install git systemd \
  
positive.code: WORKDIR /work
  RUN ./pkg/deb/build.sh
  
  FROM ubuntu:xenial AS xenial
  
  RUN set -x; apt-get update && \
      DEBIAN_FRONTEND=noninteractive apt-get -y -t xenial-backports install debhelper && \
  
negative.code: WORKDIR /work
  RUN ./pkg/deb/build.sh
  
  FROM ubuntu:hirsute AS hirsute-build
  
  RUN set -x; apt-get update && \
      DEBIAN_FRONTEND=noninteractive apt-get -y install git systemd \
  