Use `diskSelector` variable #326

Job	Run time
nixos-aarch64 (umbriel.nixos.org)	36s
nix-build	1m 17s
nix-darwin (m1)	1m 17s
nixos-aarch64 (goofy-hopcroft)	32s
nixos-x86_64 (caliban.nixos.org)	38s
nixos-x86_64 (elated-minsky)	33s
nix-darwin (m2-large)	1m 27s
nixos-x86_64 (sleepy-brown)	38s
	6m 58s

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