Added environment UNIT_SOURCE as an example.

docker-compose-prod.yml

@@ -28,6 +28,9 @@ services:
       - redis
       - reverb
     env_file: app/application/.env
+    environment:
+      CONTAINER_ROLE: app
+      UNIT_SOURCE: '["172.16.0.0/12"]'
   queue:
     build:
       context: app