$ nix-build -A armv6l-linux.sdImage
$ nix-build -A armv7l-linux.sdImage
$ nix-build -A armv7l-linux.isoImage
$ nix-build -A aarch64-linux.sdImage
$ nix-build -A aarch64-linux.isoImage
$ nix-build -A armv6l-linux.sdImage
$ nix-build -A armv7l-linux.sdImage
$ nix-build -A armv7l-linux.isoImage
$ nix-build -A aarch64-linux.sdImage
$ nix-build -A aarch64-linux.isoImage