anchor.diff: -FROM alpine:3.7 AS builder
  +FROM alpine:3.8 AS builder
   
   COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
   
  
positive.code: 
  # =============================
  
  FROM alpine:3.7
  
  WORKDIR /srv
  
  
negative.code:         php7-iconv \
          php7-mbstring \
          php7-curl \
          php7-ctype \
          php7-opcache \
          php7-sockets \
          php7-openssl
  