Added environment UNIT_SOURCE as an example.

docker-compose-prod_docker-hub.yml

@@ -18,6 +18,9 @@ services:
       - redis
       - reverb
     env_file: app/.env
+    environment:
+      CONTAINER_ROLE: app
+      UNIT_SOURCE: '["172.16.0.0/12"]'
   queue:
     image: korelf/service-captcha:0.8.1
     #  restart: always