flake.nix: add disko to default devshell

flake.nix

@@ -280,7 +280,16 @@
     };
 
     devShells = forAllSystems (system: {
-      default = nixpkgs-unstable.legacyPackages.${system}.callPackage ./shell.nix { };
+      default = let
+        pkgs = import nixpkgs-unstable {
+          inherit system;
+          overlays = [
+            (final: prev: {
+              inherit (inputs.disko.packages.${system}) disko;
+            })
+          ];
+        };
+      in pkgs.callPackage ./shell.nix { };
       cuda = let
         cuda-pkgs = import nixpkgs-unstable {
           inherit system;

shell.nix

@@ -1,15 +1,16 @@
 { pkgs ? import <nixpkgs> {} }:
 pkgs.mkShellNoCC {
   packages = with pkgs; [
-    just
-    jq
+    disko
+    editorconfig-checker
+    gnupg
     gum
+    jq
+    just
+    openstackclient
     sops
     ssh-to-age
-    gnupg
     statix
-    openstackclient
-    editorconfig-checker
   ];
 
   env = {