anchor.diff:  ENV TERRAGRUNT_VERSION=${terragrunt_version_arg}
   ENV AMI_MANAGER_VERSION=${ami_manager_arg}
   ENV NODE_VERSION=${node_version_arg}
  -ENV PIP_INSTALL_VERSION=${pip_version}
   
   # set up nodejs repo
   RUN curl -sL https://rpm.nodesource.com/setup_${NODE_VERSION} | bash -
  
positive.code: ARG terragrunt_version_arg=0.25.4
  ARG ami_manager_arg=0.8.0
  ARG node_version_arg=12.x
  ARG pip_version=21.1.3
  
  ENV PACKER_VERSION=${packer_version_arg}
  ENV ANSIBLE_VERSION=${ansible_version_arg}
  
negative.code: 
  # install ansible
  # RUN pip3.6 install --upgrade pip==21.1.3
  RUN python3 -m pip install --upgrade pip==21.1.3
  RUN pip3 install ansible==${ANSIBLE_VERSION}
  
  # install terraform and create an symlink on /usr/local
  