tahani: add headless niri workstation with Sunshine streaming

profiles/wayland-headless.nix

@@ -0,0 +1,39 @@
+{
+	pkgs,
+	user,
+	...
+}: {
+	services.seatd.enable = true;
+
+	services.pipewire = {
+		enable = true;
+		wireplumber.enable = true;
+	};
+
+	xdg.portal = {
+		enable = true;
+		extraPortals = with pkgs; [
+			xdg-desktop-portal-wlr
+			xdg-desktop-portal-gtk
+		];
+	};
+
+	programs.niri.enable = true;
+
+	users.users.${user}.linger = true;
+
+	systemd.user.services.niri-headless = {
+		description = "Niri headless session";
+		environment = {
+			WLR_BACKENDS = "headless";
+			WLR_HEADLESS_OUTPUTS = "1";
+			WAYLAND_DISPLAY = "wayland-1";
+		};
+		serviceConfig = {
+			ExecStart = "${pkgs.niri}/bin/niri --session";
+			Restart = "always";
+			RestartSec = 2;
+		};
+		wantedBy = ["default.target"];
+	};
+}