Pin version for zabbix image to 7

Author: zoltanbedi

devenv/zabbix70/docker-compose.yml

@@ -15,7 +15,7 @@ services:
 
   # Zabbix
   zabbix-server:
-    image: zabbix/zabbix-server-pgsql:alpine-trunk
+    image: zabbix/zabbix-server-pgsql:alpine-7.0-latest
     ports:
       - '10051:10051'
     depends_on:
@@ -32,7 +32,7 @@ services:
       ZBX_DEBUGLEVEL: 3
 
   zabbix-web:
-    image: zabbix/zabbix-web-apache-pgsql:alpine-trunk
+    image: zabbix/zabbix-web-apache-pgsql:alpine-7.0-latest
     ports:
       - '8188:8080'
     depends_on:
@@ -57,7 +57,7 @@ services:
       POSTGRES_PASSWORD: zabbix
 
   zabbix-agent:
-    image: zabbix/zabbix-agent:alpine-trunk
+    image: zabbix/zabbix-agent:alpine-7.0-latest
     environment:
       ZBX_SERVER_HOST: zabbix-server
       ZBX_SERVER_PORT: 10051