anchor.diff:  
   ENV PUPPET_SERVER_VERSION="$version"
   ENV DUMB_INIT_VERSION="1.2.1"
  -ENV UBUNTU_CODENAME="xenial"
  +ENV UBUNTU_CODENAME="bionic"
   ENV PUPPETSERVER_JAVA_ARGS="-Xms512m -Xmx512m"
   ENV PATH=/opt/puppetlabs/server/bin:/opt/puppetlabs/puppet/bin:/opt/puppetlabs/bin:$PATH
   ENV PUPPET_MASTERPORT=8140
  
positive.code: COPY . /puppetserver
  WORKDIR /puppetserver
  RUN lein clean && lein install
  RUN EZBAKE_ALLOW_UNREPRODUCIBLE_BUILDS=true EZBAKE_NODEPLOY=true COW=base-xenial-amd64.cow MOCK='' GEM_SOURCE=https://rubygems.org lein with-profile ezbake ezbake local-build
  RUN mv /puppetserver/output/deb/xenial/*/*.deb /puppetserver.deb
  
  FROM ubuntu:16.04
  
  ARG vcs_ref
  ARG build_date
  
negative.code: COPY --from=build /puppetserver.deb /puppetserver.deb
  
  RUN apt-get update && \
      apt-get install -y --no-install-recommends wget ca-certificates && \
      wget http://nightlies.puppet.com/apt/puppet6-nightly-release-"$UBUNTU_CODENAME".deb && \
      wget https://github.com/Yelp/dumb-init/releases/download/v"$DUMB_INIT_VERSION"/dumb-init_"$DUMB_INIT_VERSION"_amd64.deb && \
      dpkg -i puppet6-nightly-release-"$UBUNTU_CODENAME".deb && \
  