Build sdImage on x86_64-linux

[derfenix]

Stuck on building sdImage with error
error: a 'aarch64-linux' with features {} is required to build '/nix/store/0q91slrhl611kjhdvi1j5yrv65cik604-builder.pl.drv', but I am a 'x86_64-linux' with features {benchmark, big-parallel, kvm, nixos-test}

The boot.binfmt.emulatedSystems = [ "aarch64-linux" ]; specified, but have change nothing.

[derfenix]

removed

hostPlatform = lib.mkDefault "x86_64-linux";

got new error

 error: assertion '(system != (pkgs).stdenv.hostPlatform.system)' failed
 at /nix/store/kdynjy1mbgkdg4p196v9gx6ljpf7q4nk-source/nixos/modules/system/boot/binfmt.nix:354:9: