Add nixpkgs-2505

Author: hamishmack

ci.nix

@@ -19,6 +19,7 @@
   # short names for nixpkgs versions
   nixpkgsVersions = {
     "R2411" = inputs.nixpkgs-2411;
+    "R2505" = inputs.nixpkgs-2505;
     "unstable" = inputs.nixpkgs-unstable;
   };
 
@@ -57,7 +58,7 @@
       # cabal-install and nix-tools plans.  When removing a ghc version
       # from here (so that is no longer cached) also remove ./materialized/ghcXXX.
       # Update supported-ghc-versions.md to reflect any changes made here.
-      nixpkgs.lib.optionalAttrs (nixpkgsName == "R2411") {
+      nixpkgs.lib.optionalAttrs (builtins.elem nixpkgsName ["R2411" "R2505"]) {
         ghc96 = true;
         ghc98 = true;
         ghc910 = true;

default.nix

@@ -97,6 +97,9 @@ self // {
   pkgs-2411 = import self.inputs.nixpkgs-2411 (nixpkgsArgs // {
     localSystem = { inherit system; };
   });
+  pkgs-2505 = import self.inputs.nixpkgs-2505 (nixpkgsArgs // {
+    localSystem = { inherit system; };
+  });
   pkgs-unstable = import self.inputs.nixpkgs-unstable (nixpkgsArgs // {
     localSystem = { inherit system; };
   });

flake.lock

@@ -7,6 +7,7 @@
     nixpkgs-2311 = { url = "github:NixOS/nixpkgs/nixpkgs-23.11-darwin"; };
     nixpkgs-2405 = { url = "github:NixOS/nixpkgs/nixpkgs-24.05-darwin"; };
     nixpkgs-2411 = { url = "github:NixOS/nixpkgs/nixpkgs-24.11-darwin"; };
+    nixpkgs-2505 = { url = "github:NixOS/nixpkgs/nixpkgs-25.05-darwin"; };
     nixpkgs-unstable = { url = "github:NixOS/nixpkgs/nixpkgs-unstable"; };
     flake-compat = { url = "github:input-output-hk/flake-compat/hkm/gitlab-fix"; flake = false; };
     "hls-1.10" = { url = "github:haskell/haskell-language-server/1.10.0.0"; flake = false; };