main/postmarketos-ui-sway: enable portals (MR 5643)

This adds the wlr and GTK portal backends so that apps using portals will work OOTB.

The GTK backend is added because the wlr backend does not provide some essential portals, e.g. for camera
[ci:skip-build]: already built successfully in CI

main/postmarketos-ui-sway/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Oliver Smith <ollieparanoid@postmarketos.org>
 pkgname=postmarketos-ui-sway
 pkgver=3.1
-pkgrel=7
+pkgrel=8
 pkgdesc="(Wayland) Tiling WM, drop-in replacement for i3wm (DOES NOT RUN WITHOUT HW ACCELERATION!)"
 url="https://postmarketos.org"
 arch="noarch"
@@ -18,6 +18,8 @@ depends="
 	sway
 	swaybg
 	tinydm
+	xdg-desktop-portal-gtk
+	xdg-desktop-portal-wlr
 	"
 _pmb_recommends="
 	dmenu