It looks like this needs to be set for the tvix pipeline to succeed.
It was set to `canon` for `tvl-kit` (not sure if manually, or some
autodetection previously did it for us that's not present anymore).
Anyways, this sets it to how it's set in the web interface, to hopefully
fix it.
Change-Id: Ic3eb60e3f421fa949a84dcdaa928823ff45f679a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8008
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
30c4454056