master nix: update to 2.3.6 (#1833)

* nix: default to latest nix

This gets nix from the `latest` [symlink](https://nixos.org/releases/nix/latest/) by default, so this file doesn't need to be kept in sync with nix releases.

* nix: multi-user install on Linux

* Invoke nix-install with --daemon option

Co-authored-by: Travis A. Everett <travis.a.everett@gmail.com>

* nix: default to 2.3.6

* nix: fix install url

* write config to /tmp/nix.conf

The linux build is objecting because /etc/nix/ already exists.

* stop creating /nix for 2.2.x installers

Prior to https://github.com/NixOS/nix/pull/3054, the daemon installer
required /nix to be empty. This no longer creates them.

I *think* they are vestigial now that this uses a daemon install. But,
I can't swear I *know* they're obsolete. :)

Co-authored-by: Travis A. Everett <travis.a.everett@gmail.com>

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