Docker-compose environment variables

Question

I am trying to setup a postgres container and want to setup the postgres login with:

POSTGRES_USER: docker
POSTGRES_PASSWORD: docker

So I have

Answer 1

Thanks to Bryan with the docker-compose exec containername env I have discovered that the need is also to delete volumes. Since for the docker-compose volume rm volumename you need to know the exact name it is easier just to delete all with:

docker-compose down --volumes