updated to zabbix 3.2

frontend/Dockerfile

         wget &&\
         apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-RUN wget http://repo.zabbix.com/zabbix/3.0/debian/pool/main/z/zabbix-release/zabbix-release_3.0-1+jessie_all.deb -O /tmp/zabbix.deb &&\
+ARG ZABBIX_VERSION=3.2
+
+RUN wget http://repo.zabbix.com/zabbix/${ZABBIX_VERSION}/debian/pool/main/z/zabbix-release/zabbix-release_${ZABBIX_VERSION}-1+jessie_all.deb -O /tmp/zabbix.deb &&\
     dpkg -i /tmp/zabbix.deb
 
 RUN apt-get update && apt-get -y install\

zabbix/Dockerfile

         wget &&\
         apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-RUN wget http://repo.zabbix.com/zabbix/3.0/debian/pool/main/z/zabbix-release/zabbix-release_3.0-1+jessie_all.deb -O /tmp/zabbix.deb &&\
+ARG ZABBIX_VERSION=3.2
+
+RUN wget http://repo.zabbix.com/zabbix/${ZABBIX_VERSION}/debian/pool/main/z/zabbix-release/zabbix-release_${ZABBIX_VERSION}-1+jessie_all.deb -O /tmp/zabbix.deb &&\
     dpkg -i /tmp/zabbix.deb
 
 RUN apt-get update && apt-get -y install\