anchor.diff:      && apk del .build-deps \
       && cd .. \
       && rm -Rf "node-v$NODE_VERSION" \
  -    && rm "node-v$NODE_VERSION.tar.xz" SHASUMS256.txt.asc SHASUMS256.txt
  -
  -ENV YARN_VERSION 0.24.4
  -
  -RUN apk add --no-cache --virtual .build-deps-yarn curl gnupg tar \
  +    && rm "node-v$NODE_VERSION.tar.xz" SHASUMS256.txt.asc SHASUMS256.txt \
  +
  +# ------------------------ add Yarn ------------------------
  +
  +  && apk add --no-cache --virtual .build-deps-yarn curl gnupg tar \
     && for key in \
       6A010C5166006599AA17F08146C2130DFD2497F5 \
     ; do \
  
positive.code:     
      && rm /var/www/html/install_composer.php
  
  # ------------------------ add Node / NPM / Yarn ------------------------
  
  ENV NPM_CONFIG_LOGLEVEL info
  ENV NODE_VERSION 7.10.0
  
  RUN addgroup -g 1000 node \
      && adduser -u 1000 -G node -s /bin/sh -D node \
  
negative.code: 
  ADD install_composer.php /var/www/html/install_composer.php
  
  ENV \
    S6_OVERLAY_VERSION=v1.19.1.1 \
    NGINX_VERSION 1.13.0 \
    NPM_CONFIG_LOGLEVEL info \
    NODE_VERSION 7.10.0 \
    YARN_VERSION 0.24.4
  
  # ------------------------ add nginx ------------------------
  # Taken from official nginx container Dockerfile
  
  RUN GPG_KEYS=B0F4253373F8F6F510D42178520A9993A1C052F8 \
  	&& CONFIG="\
  