hyprland: add hyprland-uwsm to passthru.providedSessions

[khaneliman]

Fix issue with displayManager defaultSession not accepting the string since it's missing from the lookup it does with
passthru.providedSessions.

Related #474174 (comment)

services.displayManager.defaultSession uses this passthru

nixpkgs/nixos/modules/services/display-managers/default.nix

Lines 122 to 132 in e12e33e

	defaultSession = lib.mkOption {
	type = lib.types.nullOr lib.types.str // {
	description = "session name";
	check =
	d:
	lib.assertMsg (d != null -> (lib.types.str.check d && lib.elem d cfg.sessionData.sessionNames)) ''
	Default graphical session, '${d}', not found.
	Valid names for 'services.displayManager.defaultSession' are:
	${lib.concatStringsSep "\n " cfg.sessionData.sessionNames}
	'';
	};

nixpkgs/nixos/modules/services/display-managers/default.nix

Lines 241 to 252 in e12e33e

	services.displayManager.sessionData = {
	desktops = installedSessions;
	sessionNames = lib.concatMap (p: p.providedSessions) cfg.sessionPackages;
	# We do not want to force users to set defaultSession when they have only single DE.
	autologinSession =
	if cfg.defaultSession != null then
	cfg.defaultSession
	else if cfg.sessionData.sessionNames != [ ] then
	lib.head cfg.sessionData.sessionNames
	else
	null;
	};

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[fufexan]

Didn't even know about this missing piece of the puzzle, LGTM.

[rhoriguchi]

This should also be upstreamed https://github.com/hyprwm/Hyprland/blob/fa41c8229d46d655bbd3128c0a3844a8d4615c13/nix/default.nix#L233

[khaneliman]

This should also be upstreamed https://github.com/hyprwm/Hyprland/blob/fa41c8229d46d655bbd3128c0a3844a8d4615c13/nix/default.nix#L233

Sure, created a PR