anchor.diff: -FROM alpine:edge
  +FROM alpine:3.5
   
   RUN NGINX_GPG_KEYS=B0F4253373F8F6F510D42178520A9993A1C052F8 \
       NGINX_VERSION=1.11.8 \
       RTMP_VERSION=1.1.10 \
       HEADERS_MORE_VERSION=0.32 \
  +    NGINX_UID=99 \
  +    NGINX_USER=nginx \
   	&& NGINX_CONF="\
   		--prefix=/etc/nginx \
   		--sbin-path=/usr/sbin/nginx \
  
positive.code: 	&& apk del .gettext --purge \
  	&& mv /tmp/envsubst /usr/local/bin/ \
  	\
  	# fix path to html files in nginx.conf
  	&& sed -i "s/root   html;/root \/usr\/share\/nginx\/html;/" /etc/nginx/nginx.conf \
  	\
  
negative.code: 		--with-ipv6 \
  		--with-pcre \
  		--with-pcre-jit \
  		--with-compat \
  		--add-module=/usr/src/ngx_brotli \
  		--add-dynamic-module=/usr/src/nginx-rtmp-module-$RTMP_VERSION \
  		--add-dynamic-module=/usr/src/headers-more-nginx-module-$HEADERS_MORE_VERSION \
  	" \
  	&& addgroup -g $NGINX_UID -S $NGINX_USER \
  	&& adduser -D -S -H -h /var/cache/nginx -u $NGINX_UID -s /sbin/nologin -G $NGINX_USER $NGINX_USER \
  	&& apk add --no-cache --virtual .build-deps \
  	    build-base \
  	    file \
  