bug#51487: The openssh service does not allow multiple authorized key files per user

[Vivien Kraus]

Dear guix,

The openssh service is configured with a list of authorized keys, as a
list of items, where each item is a list of 2 values, the user name (as
a string) and the public key file (a file-like object). The service can
be extended with new keys.

To have multiple keys per user, we can put them on the same file-like
object, each on its own line. However, if we put two different records,
only the last one is remembered.

This is a problem if we want to extend the service for users that
already have a key. As I am trying to create a service that would
convert GPG keys to SSH keys, I am in this exact situation: the users
may have already defined SSH keys, and I want to add some more without
losing the others.

Best regards,

Vivien

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