Using an actual store path here means we have to copy all of depot into
the Nix store just to rebuild NixOS for a system - this is especially
painful if, like me, you have a rust target/ directory in depot which is
hundreds of GB - nix-build just OOMed on my system with 128GB of RAM!
There's no reason to use a store path here - we can just point to
wherever depot happened to be cloned.
Change-Id: Ibfd7181f0f75de077561db70ac8636389836980f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10997
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: aspen <root@gws.fyi>
Tested-by: BuildkiteCI
f50800a9df