I've set up an environment successfully but as far as I can tell the data in the database doesn't persist if the environment is taken down. This means that if I do a docker-compose down (e.g. to work on another project) and come back to it then I have to start again with installing Wordpress. Is this intentional?

For my own use I've created a branch where the database has a volume to persist its data. I'm happy to open a pull request if this change will be useful to others.