anchor.diff:  RUN unzip -j /tmp/packer-post-processor-amazon-ami-management_${AMI_MANAGER_VERSION}_linux_amd64.zip -d ~/.packer.d/plugins
   
   # install ansible
  -RUN pip3.6 install pip --upgrade
  +RUN pip3.6 install pip=${PIP_VERSION}
   RUN pip3 install ansible==${ANSIBLE_VERSION}
   
   # install terraform and create an symlink on /usr/local
  
positive.code: ARG terragrunt_version_arg=0.25.4
  ARG ami_manager_arg=0.8.0
  ARG node_version_arg=12.x
  
  ENV PACKER_VERSION=${packer_version_arg}
  ENV ANSIBLE_VERSION=${ansible_version_arg}
  
negative.code: ENV TERRAGRUNT_VERSION=${terragrunt_version_arg}
  ENV AMI_MANAGER_VERSION=${ami_manager_arg}
  ENV NODE_VERSION=${node_version_arg}
  ENV PIP_VERSION=${pip_version}
  
  # set up nodejs repo
  RUN curl -sL https://rpm.nodesource.com/setup_${NODE_VERSION} | bash -
  