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OpenSSH in Debian Trixie has removed support for ssh-dss (DSA) keys, which will
prevent users with such keys from logging in after upgrade. To avoid lockouts,
add a loud deprecation warning when users log in using a DSA key. This warning
advises affected users to replace their keys with a supported algorithm (e.g.,
ed25519 or RSA) before the upgrade.
Deprecation warning will be displayed during "commit" but also as MOTD to inform
on this issue during every login.
DEPRECATION WARNING: Support for SSH-DSA keys is deprecated and will
be removed in VyOS 1.6. Please update affected keys to a supported
algorithm (e.g., RSA, ECDSA or ED25519) to avoid authentication
failures after the upgrade. The following hostkey-algorithms are in
use: ssh-dss, ssh-dss-cert-v01@openssh.com
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