Migrate to flakes

configuration.nix

@@ -36,7 +36,7 @@
     timeout = 3;
   };
 
-  # Run Nix garbage collector, while avoiding compiling
+  # Run Nix garbage collector and enable flakes
   nix = {
     autoOptimiseStore = true;
     gc = {
@@ -48,7 +48,9 @@
       keep-outputs = true
       keep-derivations = true
       gc-keep-outputs = true
+      experimental-features = nix-command flakes
     '';
+    package = pkgs.nixUnstable;
   };
 
   # Clean tmp directory on shutdown

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "System configuration for panacea";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    agenix.url = "github:ryantm/agenix";
+    agenix.inputs.nixpkgs.follows = "nixpkgs";
+    emacs-overlay.url = "github:nix-community/emacs-overlay";
+    rnix-lsp.url = "github:nix-community/rnix-lsp";
+  };
+
+  outputs = inputs@{ self, nixpkgs, agenix, ... }:
+    let
+      system = "x86_64-linux";
+
+      pkgs = import pkgs {
+        inherit system;
+        config.allowUnfree = true;
+      };
+
+      lib = nixpkgs.lib;
+
+    in {
+      nixosConfigurations.panacea = lib.nixosSystem {
+        inherit system;
+        modules = [ (import ./configuration.nix) agenix.nixosModules.age ];
+      };
+    };
+}