_qemu_default_ssh_key() returns '' when the user has no public key, so the
deployment injects none through cloud-init: the VM boots with no SSH access and
its state can no longer be checked once created.
--setup-host now generates an ed25519 key without passphrase when neither
id_ed25519.pub nor id_rsa.pub is present, so the Deployment profile leaves a
host able to reach the VMs it creates.
The key is created AS the invoking user via « sudo -u », not as root: under
sudo « ~ » is /root and the key would land where cloud-init never looks.
Verified on a fresh Arch VM with no key: it is created as erplibre:erplibre
with 700/600/644, a rerun keeps the same fingerprint, and
_qemu_default_ssh_key() now returns it.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Mathieu Benoit
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