The issue with auto-reboot here is you need to monitor the installation and then select memtest86 after it has finished.
Either somehow set up the bootloader so it runs memtest86 on the first boot, or move memtest86 at the end (but user reboot is still necessary so it's not clear what has been added with auto-reboot, and also auto-reboot loses any messages printed by nixos-install), or revert this change.
The issue with auto-reboot here is you need to monitor the installation and then select memtest86 after it has finished.
Either somehow set up the bootloader so it runs memtest86 on the first boot, or move memtest86 at the end (but user reboot is still necessary so it's not clear what has been added with auto-reboot, and also auto-reboot loses any messages printed by nixos-install), or revert this change.
The issue with auto-reboot here is you need to monitor the installation and then select memtest86 after it has finished.
Either somehow set up the bootloader so it runs memtest86 on the first boot, or move memtest86 at the end (but user reboot is still necessary so it's not clear what has been added with auto-reboot, and also auto-reboot loses any messages printed by nixos-install), or revert this change.