I can specify a list of users that are allowed to promote builds, but I can't use linux user groups to specify who can promote builds.
The docs imply that groups can be used, but this does not appear to be the case.

Note that my groups are pulled from ldap.

$> id
uid=1061(bedge) gid=1000(builduser) groups=1000(builduser)

Specifying "builduser" does not show the "approve" button.

Specifying "bedge" does work, but builduser does not.