Pin flakes registry

flake.nix

@@ -6,7 +6,7 @@
   };
 
   outputs =
-    { nixpkgs, ... }:
+    inputs@{ nixpkgs, ... }:
     {
       nixosConfigurations = (
         let

shared/base.nix

@@ -1,4 +1,9 @@
-{ pkgs, lib, ... }:
+{
+  pkgs,
+  lib,
+  inputs,
+  ...
+}:
 {
   imports = [ /etc/nixos/hardware-configuration.nix ];
 
@@ -142,6 +147,9 @@
     };
 
     nix = {
+      registry = {
+        nixpkgs.flake = inputs.nixpkgs;
+      };
       settings = {
         experimental-features = [
           "nix-command"