anchor.diff:  RUN unzip /root/workspace/packer_${PACKER_VERSION}_linux_amd64.zip -d /opt/packer/
   RUN ln -s /opt/packer/packer /usr/local/bin/packer
   
  -# install ansible
  -RUN pip3.6 install pip --upgrade
  +# install packer plugins
  +RUN mkdir -p ~/.packer.d/plugins
  +RUN wget https://github.com/wata727/packer-post-processor-amazon-ami-management/releases/download/v_${AMI_MANAGER_VERSION}/packer-post-processor-amazon-ami-management_${AMI_MANAGER_VERSION}_linux_amd64.zip -P /tmp/
  +RUN cd ~/.packer.d/plugins
  +RUN unzip -j /tmp/packer-post-processor-amazon-ami-management_${AMI_MANAGER_VERSION}_linux_amd64.zip -d ~/.packer.d/plugins
  +
  +
  +# install ansibleA
  +RUAN pip3.6 install pip --upgrade
   RUN pip3 install ansible==${ANSIBLE_VERSION}
   
   # install terraform and create an symlink on /usr/local
  
positive.code: 
  # install pip packages
  RUN pip3 install boto3 sh argparse awscli
  
negative.code: ARG ansible_version_arg=2.8.3
  ARG terraform_version_arg=0.12.24
  ARG terragrunt_version_arg=0.23.18
  ARG ami_manager_arg=0.8.0
  
  ENV PACKER_VERSION=${packer_version_arg}
  ENV ANSIBLE_VERSION=${ansible_version_arg}
  ENV TERRAFORM_VERSION=${terraform_version_arg}
  ENV TERRAGRUNT_VERSION=${terragrunt_version_arg}
  ENV AMI_MANAGER_VERSION=${ami_manager_arg}
  
  RUN yum update -y && \
      yum install -y wget && \
  