anchor.diff:  FROM php:7.4-fpm-alpine
  +
  +# userid of www-data (linux support file permissions)
  +ARG DOCKER_WWW_USER_ID=1000
  +ARG DOCKER_WWW_GROUP_ID=1000
  +ENV DOCKER_WWW_USER_ID $DOCKER_WWW_USER_ID
  +ENV DOCKER_WWW_GROUP_ID $DOCKER_WWW_GROUP_ID
  +RUN apk add shadow \
  +    && usermod --non-unique --uid ${DOCKER_WWW_USER_ID} www-data \
  +    && groupmod --gid ${DOCKER_WWW_GROUP_ID} www-data
   
   # Install Packages
   RUN apk update
  
positive.code: WORKDIR /var/www/html
  
  EXPOSE 80 443
  
negative.code: # Install Docker Packages
  RUN docker-php-ext-install mysqli pdo pdo_mysql tokenizer xml zip
  
  # Install Composer
  RUN curl -sS https://getcomposer.org/installer \
      | php -- --install-dir=/usr/local/bin --filename=composer
  