Make nix, package configurable.

[mikepurvis]

Addresses #136, making it possible to deploy the harmonia-dev module on systems with an older nixpkgs without overlay shenanigans— tell the module what Harmonia package to use, and tell that Harmonia package which Nix to build against:

  services.harmonia-dev = {
    enable = true;
    package = harmonia.packages.${system}.harmonia.override {
      inherit (nix_2_17.packages.${system}) nix;
    };
  };

[Mic92]

Btw. The current nixos release also has a package option for harmonia: https://search.nixos.org/options?channel=23.05&show=services.harmonia.package&from=0&size=50&sort=relevance&type=packages&query=harmonia

[Mic92]

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[mikepurvis]

I saw, yes! But I'm interested in getting the latest fixes that are in this repo, and I also am running some patches on top of hydra-dev as well, so it feels easier to run them from their flakes than try to deal with overriding the upstreamed versions.

Ironically, CI for this is failing in the exact same way that this change is meant to make easier to prevent/overcome— it's trying to link against a version of nix that's too old.

[Mic92]

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✅ The pull request has been merged automatically

The pull request has been merged automatically at f292063