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Check NixOS configurations / eval-hosts (pull_request) Failing after 14m48s
Distributed builds failed with "Host key verification failed" on any client that had never manually SSH'd to nix-cache before, since nothing populated root's known_hosts for it. Wire nix-cache's host public key into programs.ssh.knownHosts via a new vars.nixCacheHostKey so every client picks it up automatically on rebuild. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>