Minor updates

[tim-day-387]

I noticed that bcachefs-tools got dropped from Debian - it caused an install failure when setting up ktest on my laptop. I saw you had a patch to build it when running interactively. I imagine we'd need to unconditionally build it from git, even in non-interactive mode. Curious your thoughts.

Also, added a small Lustre convenience ktest. Still trying to find cycles for my OSD ktests.

[koverstreet]

Well, the reason I switched to the debian package is because the CI has multiple workers sharing the same ktest and bcachefs-tools repos, and different workers racing and trying to build bcachefs-tools at the same time doesn't work.

So test dependencies really need to be packaged for non interactive use :/

yet another reason we need to get this converted to nixos - that will make all this cleaner and we won't be relying on any centralized package repository

[tim-day-387]

Couple quick questions:

1. Do you have some example config files for the CI? Or a quick run down? I was testing it out - but only able to get it partially working (i.e. Apache renders my user and branch, but I couldn't the CI to generate a list of jobs for the workers to consume). I wanted to try leveraging that for running ktests locally in parallel. And it'd help me understand the concurrency issue with the workers building bcachefs-tools.
2. I see the nixOS stuff in the repository. Is that just a skeleton? Are you aiming to remove Debian long-term and move entirely to nixOS?

We could build bcachefs-tools into the root image rather than building it at test time. But then something (or someone) would have to periodically update it. Although the Debian bcachefs-tools lagged behind, so maybe that isn't a huge concern.