nixos-anywhere: speed up --build-on remote
#559
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--build-on remote
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This PR significantly speeds up installing my system from scratch from around 1 hour down to 10 minutes with
--build-on remoteand substituting most of the paths from a HTTP binary cache.The main speed up is from using
ssh-ng://instead ofssh://for copying derivations by removing thenix copy --derivation --to ssh://...commands which is viable now that NixOS/nix#7359 should be fixed.SSH store compression makes a small but observable difference when copying derivations as part of the
nix build.