Fix Zabbix database environment variables

scripts/deploy-zabbix.sh

@@ -720,8 +720,8 @@ target_server_image=${NEW_SERVER_IMAGE}
 current_web_image=${OLD_WEB_IMAGE}
 target_web_image=${NEW_WEB_IMAGE}
 
-postgres_host=${POSTGRES_HOST}
-postgres_port=${POSTGRES_PORT}
+postgres_host=${DB_HOST}
+postgres_port=${DB_PORT}
 postgres_database=${POSTGRES_DB}
 postgres_user=${POSTGRES_USER}
 EOF
@@ -1076,7 +1076,7 @@ else
 
     UPGRADE_STARTED="$(
         date -u -d '10 minutes ago' '+%Y-%m-%dT%H:%M:%SZ'
-    )
+    )"
 
 
     wait_for_zabbix_server