Docker setup for development

Thanks for answering so fast Joshua. Let me clarify. I have followed the commands in that link and am running the discourse server locally through docker. Now I want to run commands such as ‘rake db:migrate’ but how do I run those commands within the docker container? I am also confused as I dont see a Dockerfile or docker compose. My understanding is that when using docker I should be able to run ‘docker-run rake db:migrate’ to migrate the db within the docker container.