feat(os): sync umbrel SSH keys to root on boot - #2192
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After OTA the system overlay replaces /root, dropping root authorized_keys, while /home/umbrel on the data partition keeps keys. Hydrate root from umbrel keys before sshd starts and allow root key-only login. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
/root(system overlay) is replaced and rootauthorized_keysare lost/home/umbrel/.ssh/authorized_keyslives on the data partition and survives updatessshdstartsPermitRootLogin prohibit-passwordvia sshd drop-in so root key login works after updatesTest plan
/home/umbrel/.ssh/authorized_keyssystemctl start umbrel-ssh-root-keys)/root/.ssh/authorized_keysrootwith that key succeeds