add niri wm

modules/nixpkgs.nix

@@ -0,0 +1,59 @@
+{ config, lib, ... }:
+{
+  options.allowedUnfreePackages = lib.mkOption {
+    type = lib.types.listOf lib.types.str;
+    default = [ ];
+    example = [ "steam" ];
+  };
+  config = {
+    nixpkgs.config = {
+      # https://github.com/NixOS/nixpkgs/issues/197325#issuecomment-1579420085
+      allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) config.allowedUnfreePackages;
+    };
+
+    nix = {
+      settings = {
+        substituters = [
+          "https://cache.nixos.org/"
+          "https://nix-community.cachix.org"
+          "https://cache.lix.systems"
+          "https://niri.cachix.org"
+        ];
+        trusted-public-keys = [
+          "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
+          "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+          "cache.lix.systems:aBnZUw8zA7H35Cz2RyKFVs3H4PlGTLawyY5KRbvJR8o="
+          "niri.cachix.org-1:Wv0OmO7PsuocRKzfDoJ3mulSl7Z6oezYhGhR+3W2964="
+        ];
+        experimental-features = [
+          "nix-command"
+          "flakes"
+        ];
+      };
+      gc = {
+        automatic = true;
+        dates = "daily";
+        options = "--delete-older-than 7d";
+      };
+      optimise.automatic = true;
+    };
+
+    system = {
+      stateVersion = "22.11";
+      # enable auto updates
+      autoUpgrade = {
+        enable = true;
+        dates = "daily";
+        flake = "git+https://git.berlin.ccc.de/vinzenz/nixos-configuration.git";
+      };
+    };
+
+    documentation = {
+      enable = true; # documentation of packages
+      nixos.enable = false; # nixos documentation
+      man.enable = true; # manual pages and the man command
+      info.enable = false; # info pages and the info command
+      doc.enable = false; # documentation distributed in packages' /share/doc
+    };
+  };
+}