Service "app" missing

[seyfu-t]

I cloned the repo, adjusted the env variables etc which I thought I must adjust, but in the docker-compose there is a reference to a service called "app" which nginx depends on. But its never defined anywhere.

$ docker-compose up -d
ERROR: Service 'nginx' depends on service 'app' which is undefined.

removing the depends on part seems to cause no issue though