Hundreds of failed build on master following git package update

[brice]

Hello Guix,

Today I pushed 2 commits¹ related to the package to master, mainly to update it 
to 2.33.0. But since then https://data.guix.gnu.org/ went offline and Cuirass' 
evaluation #4930² has 556 failed build. Newly failed builds have unhelpful 
logs, ending with "cannot build missing derivation [...]"³.

Before pushing those commits, I build git and git-minimal successfully on 
x86_64 and assessed the total impacted package for this update to be inferior 
to 300. Did I do something wrong with the update commit? Or is it an unrelated 
issue?

I'm currently locally building some packages which have failed on the CI to see 
if I can reproduce them and to obtain more verbose build log.

¹ 
https://git.savannah.gnu.org/cgit/guix.git/log/?id=ea04295256329511b3201feaefb17900b05053b0
² https://ci.guix.gnu.org/eval/4930?status=failed
³ https://ci.guix.gnu.org/build/396873/log/raw

Cheers,
- Brice