Every buildkite user needs to be able to update these symlinks, and the
directory doesn't exist. It was probably created imperatively on whitby.
Use a tmpfiles rule creating a /nix/var/nix/gcroots/buildkite directory,
and add a `canon` symlink in there.
Change-Id: Ic4d67fbb69f77cebe891b0fff9b824713ebec87c
Reviewed-on: https://cl.snix.dev/c/snix/+/30247
Tested-by: besadii
Autosubmit: Florian Klink <flokli@flokli.de>
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
8c4f447ec7