There is also https://microvm-nix.github.io/microvm.nix/ if you want increased isolation.

	▲	sshine 2 hours ago \| parent [-]
		I can recommend MicroVM.nix, since it allows for multiple VM runtimes like QEMU, Firecracker, etc. There's also nixos-shell for ad-hoc virtual machines: https://github.com/mic92/nixos-shell