Darwin CI seems to fail because of missing xcode installation

Summary

I get these sort of errors:

warning: Nix search path entry '/nix/var/nix/profiles/per-user/root/channels' does not exist, ignoring
/nix/store/ck1slah4x89kplmi4701nwgm152075l0-toolchain

...

Using 9374f116c489443bb61df4ff148edb9c641104dd for performance metric baseline...
xcode-select: error: no developer tools were found at '/Applications/Xcode.app', and no install could be requested (perhaps no UI is present), please install manually from 'developer.apple.com'.

Expected behavior

This happened on this CI job: https://gitlab.haskell.org/ghc/ghc/-/jobs/1680663

Seems like a missconfiguration issue?

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information