demodata not working

Steps to reproduce
Login to

https://labs.play-with-docker.com/

Cloning this repo

git clone https://github.com/allegro/ralph.git
cd cd ralph/docker/

As per ralph documentation I followed the below steps

1.Then build ralph:
docker-compose build
2.To initialize database run:
docker-compose run web init
Notice that this command should be executed only once, at the very beginning.
3.If you need to populate Ralph with some demonstration data run:
docker-compose run --rm web ralph demodata
4.docker-compose up

but demodata command is not working ,
ralph is starting after login without any data

Environment
https://labs.play-with-docker.com/