main/postmarketos-base-ui-gnome: enable apk-polkit-rs service (MR 4014)

Needed by GNOME Software since
https://gitlab.alpinelinux.org/Cogitri/apk-polkit-rs/-/merge_requests/45

GNOME Software is often installed in GNOME UI's through pmb_recommends,
but it's not a dependency in any way. To avoid spilling this service
enablement everywhere, add just the openrc subpackage from the daemon.
That means that if GNOME Software is not installed or gets uninstalled,
the daemon will crash on startup. That should not be a big deal though.

[ci:skip-build] already built successfully in CI

main/postmarketos-base-ui-gnome/APKBUILD

 pkgname=postmarketos-base-ui-gnome
 pkgver=1
-pkgrel=7
+pkgrel=8
 pkgdesc="Meta package for shared configuration for GNOME-based UIs"
 url="https://postmarketos.org"
 arch="noarch"
 license="GPL-3.0-or-later"
 depends="
+	apk-polkit-rs-openrc
 	dnsmasq
 	elogind
 	gnome-bluetooth

main/postmarketos-base-ui-gnome/postmarketos-base-ui-gnome.post-install

 #!/bin/sh
 
+rc-update add apk-polkit-server default
 rc-update add bluetooth default
 rc-update add iio-sensor-proxy default
 rc-update add modemmanager default
-rc-update add networkmanager default
\ No newline at end of file
+rc-update add networkmanager default