beta release

nixos/modules/config/nix-channel.nix

···
       defaultChannel = mkOption {
         internal = true;
         type = types.str;
-        default = "https://nixos.org/channels/nixos-unstable";
+        default = "https://nixos.org/channels/nixos-25.05";
         description = "Default NixOS channel to which the root user is subscribed.";
       };
     };

nixos/modules/misc/version.nix

···
       VARIANT = optionalString (cfg.variantName != null) cfg.variantName;
       VARIANT_ID = optionalString (cfg.variant_id != null) cfg.variant_id;
       DEFAULT_HOSTNAME = config.system.nixos.distroId;
+      SUPPORT_END = "2025-12-31";
     }
     // cfg.extraOSReleaseArgs;
 

nixos/release.nix

···
 
   version = fileContents ../.version;
   versionSuffix =
-    (if stableBranch then "." else "pre") + "${toString nixpkgs.revCount}.${nixpkgs.shortRev}";
+    (if stableBranch then "." else "beta") + "${toString nixpkgs.revCount}.${nixpkgs.shortRev}";
 
   # Run the tests for each platform.  You can run a test by doing
   # e.g. ‘nix-build release.nix -A tests.login.x86_64-linux’,