Hello,

Most jobs from the 'staging' evaluation in Cuirass are cancelled:

  https://ci.guix.gnu.org/jobset/staging-staging

(scroll a few pages rightwards)

Christopher mentioned on #guix that this can happen when the derivations
have disappeared by the time Cuirass tries running a job.

Indeed, the jobs listed as cancelled have associated derivations that
are missing on Berlin, likely from the nightly GC.

Probably Cuirass should store GC roots for each .drv file.  Thoughts?

Is there a trick to make Cuirass forget about these derivations, and try
recreating the jobs?