Option to specify a custom docker-compose.yml file

[dcrebelio]

I'm in a project where they alredy have docker-compose.yml file for production enviorement.
So I tried to rename de docker-compose.yml created by sail, and start sail with:

sail -f docker-compose-sail.yml up

The project starts just fine, but I lose a lot of interesting features. For example I cannot do sail npm mysql and directly access the mysql container. I still can access it through docker commands.

I think it would be interesting to have a option to specify the docker file you want to use. Either as a .env value or as a inline command option.