anchor.diff:    && sudo mv shellcheck-latest/shellcheck /usr/local/bin \
     && rm -rf shellcheck-latest shellcheck-latest.linux.x86_64.tar.xz
   
  -# install terraform
  -RUN set -ex && cd ~ \
  -  && curl -LO https://releases.hashicorp.com/terraform/0.11.7/terraform_0.11.7_linux_amd64.zip \
  -  && sudo unzip -d /usr/local/bin terraform_0.11.7_linux_amd64.zip \
  -  && rm -f terraform_0.11.7_linux_amd64.zip
  -
  -# install terraform-docs
  -RUN set -ex && cd ~ \
  -  && curl -LO https://github.com/segmentio/terraform-docs/releases/download/v0.3.0/terraform-docs_linux_amd64 \
  -  && chmod +x terraform-docs_linux_amd64 \
  -  && sudo mv terraform-docs_linux_amd64 /usr/local/bin/terraform-docs
  -
   CMD ["/bin/sh"]
  
positive.code:   && sudo apt-get -qq update \
    && sudo apt-get -qq -y install apt-transport-https lsb-release
  
  # install Node.js
  RUN set -ex && cd ~ \
    && curl -sS https://deb.nodesource.com/gpgkey/nodesource.gpg.key | sudo apt-key add - \
  
negative.code:   && sudo apt-get -qq update \
    && sudo apt-get -qq -y install yarn
  
  # install latest shellcheck
  RUN set -ex && cd ~ \
    && curl -LO https://storage.googleapis.com/shellcheck/shellcheck-latest.linux.x86_64.tar.xz \
  