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:     ca-certificates \
      libexif \
      libffi-dev \
      firefox-esr \
      chromium \
      chromium-chromedriver \
      && rm -rf /var/cache/apk/*
  
negative.code: # GeckoDriver
  #============
  ARG GECKODRIVER_VERSION=0.19.1
  RUN wget --no-verbose -O geckodriver.tar.gz https://github.com/mozilla/geckodriver/releases/download/v$GECKODRIVER_VERSION/geckodriver-v$GECKODRIVER_VERSION-linux64.tar.gz \
    && tar -zxf geckodriver.tar.gz \
    && rm geckodriver.tar.gz \
    && mv geckodriver /usr/bin/geckodriver \
    && chmod 755 /usr/bin/geckodriver   
      
  WORKDIR /app
  COPY Gemfile Gemfile.lock /app/
  