Migrate to flakes

flake.nix

@@ -0,0 +1,28 @@
+{
+  description = "System configuration for zion";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    agenix.url = "github:ryantm/agenix";
+    agenix.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, agenix, ... }@inputs:
+    let
+      system = "aarch64-linux";
+
+      pkgs = import pkgs {
+        inherit system;
+      };
+
+      lib = nixpkgs.lib;
+
+    in {
+      nixosConfigurations.zion = lib.nixosSystem {
+        inherit system;
+        modules = [ (import ./configuration.nix) agenix.nixosModules.age ];
+        specialArgs = { inherit inputs; };
+      };
+
+    };
+}