add nixos-hardware as a flake

flake.lock

@@ -118,6 +118,22 @@
         "type": "github"
       }
     },
+    "nixos-hardware": {
+      "locked": {
+        "lastModified": 1647447644,
+        "narHash": "sha256-Di7ZCXjQKEys+jxgl8Mp7a8nowRSeAbzH8c9QNYkw2k=",
+        "owner": "NixOS",
+        "repo": "nixos-hardware",
+        "rev": "32f61571b486efc987baca553fb35df22532ba63",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "master",
+        "repo": "nixos-hardware",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1647800324,
@@ -141,6 +157,7 @@
         "luftschleuse2": "luftschleuse2",
         "muccc-api": "muccc-api",
         "nixos-generators": "nixos-generators",
+        "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs"
       }
     }

flake.nix

@@ -4,6 +4,7 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
+    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
     muccc-api = {
       url = "git+https://gitlab.muc.ccc.de/muCCC/api";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -24,7 +25,8 @@
     };
   };
 
-  outputs = { self, nixpkgs, flake-utils, muccc-api, luftschleuse2, home-manager, nixos-generators, ... }: let
+  outputs = { self, nixpkgs, flake-utils, nixos-hardware, muccc-api
+            , luftschleuse2, home-manager, nixos-generators, ... }: let
     supportedSystems = flake-utils.lib.defaultSystems;
   in flake-utils.lib.eachSystem supportedSystems (system: let
     pkgs = import nixpkgs { inherit system; };
@@ -43,7 +45,7 @@
       meta = {
         nixpkgs = import nixpkgs { };
         specialArgs.flakes = {
-          inherit self nixpkgs muccc-api luftschleuse2 home-manager;
+          inherit self nixpkgs nixos-hardware muccc-api luftschleuse2 home-manager;
         };
       };
 

loungepi.nix

-{ config, pkgs, lib, ... }:
+{ config, pkgs, lib, flakes, ... }:
 
 {
   imports = [
-    "${fetchTarball "https://github.com/NixOS/nixos-hardware/archive/9886a06e4745edb31587d0e9481ad82d35f0d593.tar.gz"}/raspberry-pi/4"
+    flakes.nixos-hardware.nixosModules.raspberry-pi-4
   ];
 
   fileSystems = {