Add nixpkgs 25.11 to workflow

Author: shomykohai

.github/workflows/build.yml

@@ -12,6 +12,7 @@ jobs:
         nixPath:
           - nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/heads/nixos-unstable.tar.gz
           - nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/heads/nixos-25.05.tar.gz
+          - nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/heads/nixos-25.11.tar.gz
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository