anchor.diff:  LABEL author="Andy Perrett"
   
   RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories \
  -    && echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories
  +    && echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories \
  +    && echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
   
   RUN apk --update --upgrade add --no-cache \
       build-base \ 
  
positive.code: # GeckoDriver
  #============
  ARG GECKODRIVER_VERSION=0.19.1
  RUN wget --no-verbose -O /tmp/geckodriver.tar.gz https://github.com/mozilla/geckodriver/releases/download/v$GECKODRIVER_VERSION/geckodriver-v$GECKODRIVER_VERSION-linux64.tar.gz \
    && tar -C /opt -zxf /tmp/geckodriver.tar.gz \
    && rm /tmp/geckodriver.tar.gz \
    && mv /opt/geckodriver /opt/geckodriver-$GECKODRIVER_VERSION \
    && chmod 755 /opt/geckodriver-$GECKODRIVER_VERSION \
    && ln -fs /opt/geckodriver-$GECKODRIVER_VERSION /usr/bin/geckodriver    
      
  WORKDIR /app
  COPY Gemfile Gemfile.lock /app/
  
negative.code:     ca-certificates \
      libexif \
      libffi-dev \
      firefox \
      chromium \
      chromium-chromedriver \
      && rm -rf /var/cache/apk/*
  