Refactor flake patching/recursion

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

packages/oidcwarden/default.nix

@@ -1,21 +1,21 @@
 { pkgs, ... }:
 # AUTO-UPDATE: nix-update --flake oidcwarden
 # FIXME: https://github.com/dani-garcia/vaultwarden/pull/3899
-pkgs.rustPlatform.buildRustPackage rec {
+pkgs.rustPlatform.buildRustPackage (finalAttrs: {
   pname = "oidcwarden";
   version = "2025.6.1-2";
 
   src = pkgs.fetchFromGitHub {
     owner = "Timshel";
     repo = "OIDCWarden";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     hash = "sha256-wpb+7/a8TEaLvOiMt/POLvl+rb6hHG99audNghSJvII=";
   };
 
   useFetchCargoVendor = true;
   cargoHash = "sha256-fMePvMnefdcN90Y3BPqcKNXyg7tUd64IOUnOQis/qTU=";
 
-  env.VW_VERSION = version;
+  env.VW_VERSION = finalAttrs.version;
 
   nativeBuildInputs = with pkgs; [ pkg-config ];
   buildInputs = with pkgs; [
@@ -31,4 +31,4 @@ pkgs.rustPlatform.buildRustPackage rec {
   };
 
   meta.mainProgram = "oidcwarden";
-}
+})