anchor.diff:    && gem install bundler -v 1.15.4
   COPY Gemfile /usr/local/Gemfile
   COPY Gemfile.lock /usr/local/Gemfile.lock
  -RUN cd /usr/local && bundle install
  -RUN bundle binstub bundler --force
  +RUN cd /usr/local && bundle install && bundle binstub bundler --force
   
   #install fly-cli
   RUN curl "https://buildpacks.ci.cf-app.com/api/v1/cli?arch=amd64&platform=linux" -sfL -o /usr/local/bin/fly \
  
positive.code: 
  ENV LANG="C.UTF-8"
  
  RUN apt-get update && apt-get install -y curl
  
  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 \
  
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 \
  