anchor.diff:  
   # Add MariaDB repository
   RUN apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xF1656F24C74CD1D8 \
  -    && echo "deb http://ftp.igh.cnrs.fr/pub/mariadb/repo/$MARIADB_MAJOR/debian jessie main" > /etc/apt/sources.list.d/mariadb.list \
  +    && echo "deb http://ftp.igh.cnrs.fr/pub/mariadb/repo/$MARIADB_MAJOR/debian stretch main" > /etc/apt/sources.list.d/mariadb.list \
       && { \
   		     echo 'Package: *'; \
   		     echo 'Pin: release o=MariaDB'; \
  
positive.code:     && LC_ALL=C DEBIAN_FRONTEND=noninteractive apt install -y --no-install-recommends \
        ca-certificates \
        curl  \
      && curl -L -o light-baseimage.tar.gz https://github.com/osixia/docker-light-baseimage/archive/${LIGHT_BASEIMAGE_VERSION}.tar.gz \
      && mkdir -p container \
      && tar -xf light-baseimage.tar.gz -C container --strip-components 2 docker-light-baseimage-${LIGHT_BASEIMAGE_VERSION}/image \
      && cd container \
  
negative.code: FROM ruby:2.4.1-slim-stretch
  MAINTAINER Bertrand Gouny <bertrand.gouny@osixia.net>
  
  ENV ZAMMAD_DIR /home/zammad
  