anchor.diff:    && apk --no-cache upgrade \
     && apk --no-cache --virtual .build-deps add \
       gcc \
  -    libffi-dev~$FFI_VERSION \
       linux-headers \
       make \
       musl-dev \
  
positive.code: ENV CHROMIUM_VERSION 80.0
  ENV DATABASE_LIBRARY_VERSION 1.2
  ENV FAKER_VERSION 5.0.0
  ENV FFI_VERSION 3.3
  ENV FIREFOX_VERSION 75.0
  ENV FTP_LIBRARY_VERSION 1.9
  ENV GECKO_DRIVER_VERSION v0.26.0
  
negative.code:   && apk --no-cache add \
      "chromium~$CHROMIUM_VERSION" \
      "chromium-chromedriver~$CHROMIUM_VERSION" \
      "firefox~$FIREFOX_VERSION" \
      xauth \
      "xvfb-run~$XVFB_VERSION" \
  