This is what I've built [1], and I'm using it daily for things like agent sandboxing when I deploy it builds a new image completely replaces the OS disk - on up

This is what I've built [1], and I'm using it daily for things like agent sandboxing when I deploy it builds a new image completely replaces the OS disk - on upgrade it only keeps its data drive mounted to /var. [1] https://github.com/EnigmaCurry/nixos-vm-template https://github.com/EnigmaCurry/nixos-vm-template