anchor.diff:    python-dev \
     python-pip \
     shellcheck \
  +  cf-cli \
     vim \
     wget \
     zip \
  
positive.code: 
  RUN curl -sL "https://keybase.io/crystal/pgp_keys.asc" | apt-key add - \
      && echo "deb https://dist.crystal-lang.org/apt crystal main" | tee /etc/apt/sources.list.d/crystal.list
  
  RUN apt-get update \
    && apt-get -y install \
  
negative.code: # composer is a package manager for PHP apps
  RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin/
  RUN mv /usr/bin/composer.phar /usr/bin/composer
  
  # download the bosh2 CLI
  RUN curl https://s3.amazonaws.com/bosh-cli-artifacts/bosh-cli-2.0.45-linux-amd64 -o /usr/local/bin/bosh2 \
  