GPU VM - #64
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liz's declarative microvm guest already builds vm-gpu against inputs.unstable, but the standalone checks.x86_64-linux.vm-gpu fell back to the default stable nixpkgs, so CUDA llama-cpp hashed differently and had to be compiled from source twice per CI run.
modules/ssh.nix contributes the openssh host keys to the persistence aspect, not to the ssh aspect, so importing ssh alone left vm-gpu with no impermanence at all. It regenerated its host keys on every restart, tripping host key verification for anyone reaching it over ssh. vm-gallery imports persistence directly and vm-coder picks it up via the coder aspect; vm-gpu was the only guest missing it.
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