Work on bringing Nix config customizations for Determinate Nix

Signed-off-by: Andrei Jiroh Halili <[e-mail]>

bin

···
+scripts

misc/nix/nix.custom.conf

···
+# Technically shared/meta-configs.nix but as a seperate conf file
+# since we use Determinate Nix on our systems.
+experimental-features = auto-allocate-uids ca-derivations cgroups configurable-impure-env daemon-trust-override dynamic-derivations fetch-closure fetch-tree flakes git-hashing impure-derivations local-overlay-store mounted-ssh-store nix-command no-url-literals parse-toml-timestamps pipe-operators read-only-local-store recursive-nix verified-fetches
+
+trusted-users = root gildedguy ajhalili2006 nixos
+
+allowed-users = gildedguy ajhalili2006 nixos
+
+trusted-public-keys = devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw= ajhalili2006-nixos-builds.cachix.org-1:fA8HXvGR1i792D+CxL2iW/TQzUcyoW7zPUmC9Q4mQLg= andreijiroh-dev.cachix.org-1:7Jd0STdBOLiNu5fiA+AKwcMqQD2PA1j9zLDGyDkuyBo= recaptime-dev.cachix.org-1:b0UBO1zONf6ceTIoR06AKhgid4ZOl5kxB/gOIdZ9J6g=
+
+trusted-substituters = https://devenv.cachix.org https://andreijiroh-dev.cachix.org https://ajhalili2006-nixos-builds.cachix.org https://recaptime-dev.cachix.org

shared/meta-configs.nix

···
 
 { config, pkgs, lib, ... }:
 
+let
+  flake = builtins.getFlake (toString ./.);
+in
 {
   # Adopted from https://fnordig.de/til/nix/home-manager-allow-unfree.html,
   # but we'll also enable it system-wide too.
···
         "https://recaptime-dev.cachix.org"
       ];
     };
+  };
+
+  # Needed since Determinate Nix manages the main config file for system.
+  environment.etc."nix/nix.custom.conf" = {
+    source = "${flake}/misc/nix/nix.custom.conf";
+    mode = "0644";
   };
 }