The seed_dummy_data command creates one CMS page per site and a dummy
admin and customer, idempotently. --purge removes exactly what it
created. It runs on start when SEED_DUMMY_DATA=True and a failure does
not stop the web server.
Runs postgres, redis, the web app and a celery worker. Dev defaults live
in .env.docker with an optional .env override. The entrypoint generates
and persists the Django secret key and waits for postgres; the web
service migrates and creates a Site row for every configured domain.
SQL dumps placed in db-init/ are restored on first start and are
git-ignored.
