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setup-sshd: Ask for authorized key for root

Description:

As proposed by @ncopa in #10459 (closed), this feature allows to provide a download URL for an SSH public key during the sshd setup.

Additionally it is possible to provide the key directly, e.g. when an answer file for setup-alpine is used or when the admin accesses the machine via a web or SSH console (like Linode's lish) that allows pasting in the full key.

I have verified that Alpine's default configuration indeed supports root access via opensshd when an SSH key is used.

References:

Fixes #10459 (closed).

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