anchor.diff:  
   ENV LANG="C.UTF-8"
   
  -RUN apt-get update && apt-get install -y curl
  +RUN apt-get update && apt-get install -y curl gnupg apt-transport-https
   
   COPY config/google-chrome-apt-key.pub /tmp/
   RUN echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list \
  
positive.code:   google-cloud-sdk \
    iptables \
    jq \
    libmysqlclient-dev \
    libpq-dev \
    libsqlite3-dev \
    libgconf-2-4 \
    lsb-release \
    module-init-tools \
    npm \
    php5 \
    python-dev \
    python-pip \
    shellcheck \
  
negative.code: RUN echo "deb http://packages.cloud.google.com/apt cloud-sdk-jessie main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list \
    && curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
  
  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 \
  