Add a linux-builder and a rosetta-builder

This allows for compiling for x86_64 linux on macOS.

flake.lock

@@ -131,6 +131,64 @@
         "type": "github"
       }
     },
+    "nix-rosetta-builder": {
+      "inputs": {
+        "nixos-generators": "nixos-generators",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1745249216,
+        "narHash": "sha256-bNuaIdGrs8LfintWymo9KQTILwVxsw5T6zdfxZY6K0g=",
+        "owner": "cpick",
+        "repo": "nix-rosetta-builder",
+        "rev": "5cf6aa1f3f2fbb70443d33b5ef7779b7c7063392",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cpick",
+        "repo": "nix-rosetta-builder",
+        "type": "github"
+      }
+    },
+    "nixlib": {
+      "locked": {
+        "lastModified": 1736643958,
+        "narHash": "sha256-tmpqTSWVRJVhpvfSN9KXBvKEXplrwKnSZNAoNPf/S/s=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "1418bc28a52126761c02dd3d89b2d8ca0f521181",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "type": "github"
+      }
+    },
+    "nixos-generators": {
+      "inputs": {
+        "nixlib": "nixlib",
+        "nixpkgs": [
+          "nix-rosetta-builder",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1737057290,
+        "narHash": "sha256-3Pe0yKlCc7EOeq1X/aJVDH0CtNL+tIBm49vpepwL1MQ=",
+        "owner": "nix-community",
+        "repo": "nixos-generators",
+        "rev": "d002ce9b6e7eb467cd1c6bb9aef9c35d191b5453",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixos-generators",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1744932701,
@@ -200,6 +258,7 @@
         "darwin": "darwin",
         "emacs-larstvei": "emacs-larstvei",
         "home-manager": "home-manager",
+        "nix-rosetta-builder": "nix-rosetta-builder",
         "nixpkgs": "nixpkgs_3"
       }
     },

flake.nix

@@ -13,11 +13,15 @@
       url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    nix-rosetta-builder = {
+      url = "github:cpick/nix-rosetta-builder";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     emacs-larstvei.url = "github:larstvei/emacs-flake";
   };
 
   outputs =
-    { darwin, home-manager, ... }@inputs:
+    { darwin, home-manager, nix-rosetta-builder, ... }@inputs:
     {
       darwinConfigurations."larstvei-macbookpro" = darwin.lib.darwinSystem {
         system = "aarch64-darwin";
@@ -26,6 +30,11 @@
           ./modules/core.nix
           ./modules/macos.nix
 
+          nix-rosetta-builder.darwinModules.default
+          {
+            nix-rosetta-builder.onDemand = true;
+          }
+
           home-manager.darwinModules.default
           {
             home-manager = {

modules/core.nix

@@ -3,6 +3,9 @@
   nix = {
     package = pkgs.nix;
 
+
+    linux-builder.enable = true;
+
     settings = {
       experimental-features = [
         "nix-command"