refactor(nixos): convert system to use flakes

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1740367490,
+        "narHash": "sha256-WGaHVAjcrv+Cun7zPlI41SerRtfknGQap281+AakSAw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "0196c0175e9191c474c26ab5548db27ef5d34b05",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,18 @@
+{
+  outputs = {
+    self,
+    nixpkgs,
+    ...
+  } @ inputs: {
+    nixosConfigurations = {
+      nemesis = nixpkgs.lib.nixosSystem {
+        specialArgs = { inherit inputs; };
+        modules = [ ./hosts/nemesis ];
+      };
+    };
+  };
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+}