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Description of problem:

Now that we have https://github.com/coreos/ssh-key-dir packaged for C9S / RHEL 9, and support in the MCO, we should switch the Ignition behavior to make use of it and include support in SCOS/RHCOS.

Additional info:

https://issues.redhat.com/browse/COS-1589

PR filed: https://gitlab.com/redhat/centos-stream/rpms/ignition/-/merge_requests/11

[core@cosa-devsh ~]$ rpm -q ignition
ignition-2.14.0-2.el9.x86_64
[core@cosa-devsh ~]$ ls -Rl ~/.ssh/
/var/home/core/.ssh/:
total 0
drwx------. 2 core core 22 Aug 30 18:00 authorized_keys.d

/var/home/core/.ssh/authorized_keys.d:
total 4
-rw-------. 1 core core 798 Aug 30 18:00 ignition
[core@cosa-devsh ~]$ cat ~/.ssh/authorized_keys.d/ignition 
ssh-rsa AAAAB... mnguyen
ssh-rsa AAAAB.. core@default

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: ignition security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2022:8126