bento: use flake-utils to support all systems

flake.lock

@@ -1,5 +1,23 @@
 {
   "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1687171271,
+        "narHash": "sha256-BJlq+ozK2B1sJDQXS3tzJM5a+oVZmi1q0FlBK/Xqv7M=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "abfb11bd1aec8ced1c9bb9adfe68018230f4fb3c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1664883812,
@@ -18,8 +36,24 @@
     },
     "root": {
       "inputs": {
+        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -2,13 +2,18 @@
   description = "bento: an asynchronous NixOS deployment tool";
 
   inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-22.05;
+  inputs.flake-utils.url = "github:numtide/flake-utils";
 
-  outputs = { self, nixpkgs }: {
-
-    packages.x86_64-linux.default =
-      with import nixpkgs { system = "x86_64-linux"; };
-
-      stdenv.mkDerivation {
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in {
+        packages.default = pkgs.stdenv.mkDerivation {
           name = "bento";
           src = self;
 
@@ -27,5 +32,6 @@
             install -Dm444 utils/bento.nix $out/share/
           '';
         };
-  };
+      }
+    );
 }