nixos_config/system/sshKeys.nix

{
  mySSHKeys = [
    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE5E4BLKTeFAeRdIMJbdi1ZcphWF3WnJAZ6FX6zbKHI3" # NixOS WSL
  ];
}