Prevent disabling django admin on dev environment

docker-compose-no-nginx-dev.yml

@@ -8,6 +8,7 @@ services:
     environment:
       - SERVER_ADDRESS=${SERVER_ADDRESS}
       - DEBUG_MODE=${DEBUG_MODE}
+      - DEV_MODE=True
       - COMPOSE_VERSION=03r
       - TZ=${TIMEZONE}
       - EXTRA_ALLOWED_HOSTS=${EXTRA_ALLOWED_HOSTS}