gui-apps/noctalia-shell: add systemd use flag and unit install

Signed-off-by: Luke Gompertz <luke.gompz@gmail.com>

gui-apps/noctalia-shell/metadata.xml

@@ -16,6 +16,7 @@
 		<flag name="wlsunset">Night light functionality</flag>
 		<flag name="xdg-desktop-portal">Enables “Portal” option in screen recorder</flag>
 		<flag name="xwayland">Install xwayland-satellite for xwayland support</flag>
+		<flag name="systemd">Install systemd service unit</flag>
 	</use>
 	<longdescription>
 		Noctalia is a beautiful, minimal desktop shell for Wayland that actually gets out of your way. Built on Quickshell with a warm lavender aesthetic that you can easily customize to match your vibe.

gui-apps/noctalia-shell/noctalia-shell-3.7.5.ebuild

@@ -12,7 +12,9 @@ S="${WORKDIR}/noctalia-release"
 LICENSE="MIT"
 SLOT="0"
 KEYWORDS="~amd64"
-IUSE="cliphist cava wlsunset xdg-desktop-portal evolution-data-server polkit-kde-agent matugen xwayland"
+IUSE="cliphist cava wlsunset xdg-desktop-portal evolution-data-server polkit-kde-agent matugen xwayland systemd"
+
+inherit systemd
 
 RDEPEND="
 	gui-apps/quickshell
@@ -40,6 +42,11 @@ src_install() {
 	# Install configuration files
 	insinto /etc/xdg/quickshell/noctalia-shell
 	doins -r .
+
+	# Install systemd unit
+	if use systemd; then
+		systemd_dounit Assets/Services/systemd/noctalia.service
+	fi
 }
 
 pkg_postinst() {