ci: Adapt to use new fcosKola semantics
ci: Adapt to use new fcosKola semantics

This was changed recently and broke us since we do explicitly call
`fcosKola` instead of implicitly via `fcosBuild`. Adapt to the new
semantics.

GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree