nixos/systemd: Make machinectl work with NixOS
nixos/systemd: Make machinectl work with NixOS

Images generated with nixos-install will be supported by machinectl
problem is that systemd-nspawn's private usersns feature clashes
with DynamicUser and RuntimeDirectory features, which causes NixOS
images to not boot. There is an upstream issue for this
https://github.com/systemd/systemd/issues/13622

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