Setup

Qemu binfmt emulation

sudo apt install binfmt-support qemu-user-static

In `configuration.nix`:

{
  boot.binfmt.emulatedSystems = [ "aarch64-linux" "armv7l-linux" ];
}

or in `/etc/nix/nix.conf`:

extra-platforms = aarch64-linux armv7l-linux
extra-sandbox-paths = /usr/libexec/qemu-binfmt /usr/bin/qemu-aarch64-static /usr/bin/qemu-arm-static