incomplete substituters file

[benneti]

Describe the bug
I think the incompleteness of
nixConfig.substituters = [ "https://nrdxp.cachix.org" ];
confuses nix, I follow nixos-unstable with my pkgs and had to add

# add links for binary caches here
  nixConfig.substituters = [
    "https://cache.nixos.org/"
    "https://nrdxp.cachix.org"
    "https://nix-community.cachix.org"
  ];

to again use the binary cache.

To Reproduce
Use flakes

1. maybe switch to nixos.url = "nixpkgs/nixos-unstable";
2. rebuild system

To Fix
add

  nixConfig.substituters = [
    "https://cache.nixos.org/"
    "https://nrdxp.cachix.org"
    "https://nix-community.cachix.org"
  ];

Expected behavior
have completer substituters (or none?).
Also I am a bit confused, do we still rely on the cachix configuration -- if not I think it should be deleted for it to be less confusing.

I think this PR is related: #71.

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[nrdxp]

After reviewing upstream, this config isn't even sent to the daemon yet. Once it is, we should unify the nix.conf everywhere using this mechanism, but for now it's causing issues with no benefit and should simply be reverted.

Relevant:
NixOS/nix@343239f#diff-3a977e1e533a3b628a371bf19103f87d5501dc35df5fb1142551a9896cf3b03aR539

I'll leave this open until the time comes.

[Pacman99]

Closing this, I believe substituters in nixConfig and cachix profile are good to go. Feel free to re-open if this still needs some work.