bug#59514: Stuck builds in Cuirass

[Mathieu Othacehe]

Hello Marius,

> Cuirass has a tendency to not notice when a build is finished, leaving
> it in a "running" state.
>
> The phenomenon can be observed by going to
> <https://ci.guix.gnu.org/status> and look at builds that are running for
> a suspiciously long time.

I suspect this is caused by https://issues.guix.gnu.org/59510 which
causes the worker threads to bail out.

We can probably merge those two issues. The
/var/log/cuirass-remote-server.log file on Berlin also indicates when
the build-succeeded or build-failed message is received by the server,
and how long the fetch from the worker took.

Thanks,

Mathieu