How to use a different `*.db` file during e2e tests?

Hi!

I think we should use a different SQLite database instance for e2e testing. That is to separate whatever state the local database has during development. Basically, each test run should start with a clean database (and likely even drop the db between test suites/cases as well) to ensure proper test isolation.

I've tried setting `DATABASE_URL` to `file:./data.db?` in here:

https://github.com/epicweb-dev/epic-stack/blob/97135fcd7899cab299b402f36804b0d169e87d9d/playwright.config.ts#L37-L40

> I've also tried `DATABASE_PATH: './prisma/test.db'` to no effect.

But that had no effect on the app under test; it still used `./prisma/data.db`. I might be doing something wrong here... Any hints would be appreciated!