updated to stable 4.0.3

frontend/Dockerfile

 ARG ZABBIX_VERSION=4.0
 
 RUN if [ "$(uname -m)" = "x86_64" ]; then echo -n "debian"; else echo -n "raspbian"; fi > /tmp/distrib &&\
-    wget http://repo.zabbix.com/zabbix/${ZABBIX_VERSION}/$(cat /tmp/distrib)/pool/main/z/zabbix-release/zabbix-release_${ZABBIX_VERSION}-1+stretch_all.deb -O /tmp/zabbix.deb &&\
+    wget http://repo.zabbix.com/zabbix/${ZABBIX_VERSION}/$(cat /tmp/distrib)/pool/main/z/zabbix-release/zabbix-release_${ZABBIX_VERSION}-2+stretch_all.deb -O /tmp/zabbix.deb &&\
     rm /tmp/distrib &&\
     dpkg -i /tmp/zabbix.deb
 

zabbix/Dockerfile

 RUN sed -i 's/main/main non-free/' /etc/apt/sources.list
 
 RUN if [ "$(uname -m)" = "x86_64" ]; then echo -n "debian"; else echo -n "raspbian"; fi > /tmp/distrib &&\
-    wget http://repo.zabbix.com/zabbix/${ZABBIX_VERSION}/$(cat /tmp/distrib)/pool/main/z/zabbix-release/zabbix-release_${ZABBIX_VERSION}-1+stretch_all.deb -O /tmp/zabbix.deb &&\
+    wget http://repo.zabbix.com/zabbix/${ZABBIX_VERSION}/$(cat /tmp/distrib)/pool/main/z/zabbix-release/zabbix-release_${ZABBIX_VERSION}-2+stretch_all.deb -O /tmp/zabbix.deb &&\
     rm /tmp/distrib &&\
     dpkg -i /tmp/zabbix.deb