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:   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: 
  ENV LANG="C.UTF-8"
  
  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 \
  