lms

Docker-compose v2 is now available, stable and should be compatible with docker-compose: https://docs.docker.com/compose/cli-command/
Thus, we should no longer call docker-compose but docker compose. I'm not entirely sure how we can allow older versions of Docker to keep running.

If we require a recent version of docker-compose, we should take this opportunity to get rid of the `version:

Is your feature request related to a problem? Please describe.
I'm logging this issue as a follow-up to a discussion in a related PR. The general idea that I'm proposing is that, in addition to their full name (which we already require), we could also ask users for a preferred name, and then address them by it.

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Describe the Issue

When an instructor creates an attachment unit for a lecture, Artemis will show two notifications.

To Reproduce

1. Login to Artemis as Instructor
2. Go to Units in the Lecture Overview
3. Create a new Attachment Unit
4. See two notifications

Expected behavior

One notification banner would be enough. 😉

Screenshots

<img width="600" alt="Sc

Maybe we can take this occasion to add a the documentation to this filter?

Originally posted by @eri-trabiccolo in gocodebox/lifterlms#1946 (comment)

Document the llms_new_{$this->model_post_type} filter in LLMS_Post_Model::create().

The most recent full CI build (at the time of this writing) failed due to connection refused, but it was just transient (manually browsed the site and confirmed it worked). We should add some retries to the full CI's smoke test code so that these transient failures wouldn't cause full CI failures. Relevant code is [here](https://github.com/Azu