anchor.diff: -FROM ubuntu:focal
  +FROM ubuntu:16.04
   MAINTAINER https://github.com/cloudfoundry-incubator/diego-dockerfiles
   
   ARG go_version
  
positive.code:     git \
      graphviz \
      htop \
      libpython2-dev \
      lsof \
      psmisc \
      python \
  
negative.code: 
  RUN mkdir -p $GOPATH
  
  # install build dependencies
  # - graphviz is for rendering heap w/ pprof
  RUN \
  