Switch to root user if non-root user is used for nixos installer #293
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Fix #279
Currently nixos-anywhere works with non-root users on non-NixOS installer/recovery images since it will kexec into a NixOS installer and proceed as root. But it doesn't work for NixOS installer if non-root user is used. Non-root user can be desirable if a preconfigured image is used both as Live CD and installer.
This PR allows non-root configuration by copying ~/.ssh/authorized_keys to /root/.ssh/authorized_keys and proceed as root (this should be fine regardless how user logs into the non-root user, since the nixos-anywhere.pub is what matters).