This uses the `docker compose run --rm` approach suggested by Dudo
[here](https://github.com/orgs/gitops-ci-cd/discussions/1). I'm...still
learning my around it. It has some learning curve - especially regarding
running integration tests (the current setup _keeps_ the app running
even after tests have terminated, which is probably not as-desired), but
I suspect it'll become second-nature pretty quickly and will have
outsized benefits when working in a team with heterogeneous workstation
setups.
