ci: Remove baremetal rules special case

It's not clear what this ever referred to, but it's a no-op now since
the rules are no different for .container versus directly overriding
from .container+build-rules.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35203>
1 file changed