Defer managing the nix services to determinate-nixd (builds on top of #50)#53

grahamc wants to merge 6 commits intograham/fh-469-using-determinate-nix-darwin-in-away-where-nix-darwin-doesntDeterminateSystems/determinate:graham/fh-469-using-determinate-nix-darwin-in-away-where-nix-darwin-doesntfrom

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