There is no need to use an extraStep, actually, and using derivations
reduces noise on CI.
Change-Id: I897c3c3f7e0acee8f051fcc01450ff57176726f8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6573
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Detection is broken there, too, as UIOP relies on setting the variable
before dumping the image in its portability wrapper dump-image which we
don't use at all.
Change-Id: If7bea5a8522a2e64707b1ee88d62d420bd00a952
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5112
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>