You can write a luks key to a usb stick and use that to automatically decrypt at boot. https://wiki.nixos.org/wiki/Full_Disk_Encryption#Unattended_Boot_via_USB
You can write a luks key to a usb stick and use that to automatically decrypt at boot. https://wiki.nixos.org/wiki/Full_Disk_Encryption#Unattended_Boot_via_USB