Fix building with Colmena.

Apply overlays and nixpkgs imports once
Do not set hostPlatform explicitly, set it from the network.json file

hosts/default.nix

@@ -11,20 +11,17 @@ let
       channel ? top.nixunstable,
       extraMods ? [ ],
       name,
-      system ? "x86_64-linux",
       hm ? top.hmunstable,
     }:
+    let
+      inherit (metadata.hosts.${name}) system;
+    in
     channel.lib.nixosSystem {
+      pkgs = nixpkgs.${system};
       specialArgs = {
         inherit metadata top;
       };
       modules = [
-        {
-          nixpkgs = {
-            inherit system;
-            pkgs = nixpkgs.${system};
-          };
-        }
         # Imported ones
         top.agenix.nixosModules.default
         hm.nixosModules.home-manager
@@ -51,10 +48,7 @@ in
 
   iso = unstable { name = "iso"; };
   # nix build '.#nixosConfigurations.wsl.config.system.build.installer'
-  nixos = wsl {
-    name = "wsl";
-    system = "aarch64-linux";
-  };
+  nixos = wsl { name = "wsl"; };
   # nix build '.#nixosConfigurations.wsl-aarch.config.system.build.installer'
   #nixos-arm = wsl {
   #name = "wsl";

hosts/exodus/hardware-configuration.nix

@@ -43,6 +43,5 @@
   # networking.interfaces.enp0s13f0u1.useDHCP = lib.mkDefault true;
   # networking.interfaces.wlp170s0.useDHCP = lib.mkDefault true;
 
-  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
 }

hosts/genesis/hardware-configuration.nix

@@ -31,6 +31,4 @@
   networking.useDHCP = lib.mkDefault true;
   # networking.interfaces.ens18.useDHCP = lib.mkDefault true;
   # networking.interfaces.ens19.useDHCP = lib.mkDefault true;
-
-  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
 }

hosts/hosea/hardware-configuration.nix

@@ -50,6 +50,5 @@
   # networking.interfaces.enp1s0.useDHCP = lib.mkDefault true;
   # networking.interfaces.enp2s0.useDHCP = lib.mkDefault true;
 
-  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
 }

hosts/isaiah/hardware-configuration.nix

@@ -93,6 +93,5 @@
   # networking.interfaces.enp39s0.useDHCP = lib.mkDefault true;
   # networking.interfaces.enp42s0f3u5u3c2.useDHCP = lib.mkDefault true;
 
-  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
 }

hosts/jeremiah/hardware-configuration.nix

@@ -49,6 +49,5 @@
   # networking.interfaces.enp68s0.useDHCP = lib.mkDefault true;
   # networking.interfaces.wlo2.useDHCP = lib.mkDefault true;
 
-  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
 }

hosts/proxmoxtemplate/hardware-configuration.nix

@@ -47,6 +47,4 @@
   # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
   networking.useDHCP = lib.mkDefault true;
   # networking.interfaces.enp6s18.useDHCP = lib.mkDefault true;
-
-  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
 }

hosts/vm-gitlab/hardware-configuration.nix

@@ -55,6 +55,4 @@
   # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
   networking.useDHCP = lib.mkDefault true;
   # networking.interfaces.enp6s18.useDHCP = lib.mkDefault true;
-
-  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
 }