Add a new `org.osbuild.authselect` stage for configuring system identity
and authentication sources using `authselect`. The stage runs
`authselect select` command from the image in a chroot to set the
desired 'profile_id' profile. Optionally, a list of specific profile
features to enable can be passed using the 'features' option.
Add a test case for the new stage.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
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