Draft: postmarketos-ui-sxmo-de-sway: add user to feedbackd group

A new install of sxmo-de-sway on an a64 pinephone didn't let the LEDs blink. postmarketos-default-camera pulls in feedbackd, and feedbackd owns the LED devices, not the 'video' group, like sxmo expects. Adding the user to feedbackd gets the LEDsb linking again.

There may be a better way to do this. I just copied the post-install useradd from the phosh ui package. It's possible that feedbackd isn't present on every device?

main/postmarketos-ui-sxmo-de-sway/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Miles Alan <m@milesalan.com>
 pkgname=postmarketos-ui-sxmo-de-sway
 pkgver=1.15.0
-pkgrel=1
+pkgrel=2
 pkgdesc="Simple Mobile: Mobile environment based on SXMO and running on sway"
 url="http://sr.ht/~mil/Sxmo"
 # riscv64: builder currently stuck, libphonenumber needs rebuild
@@ -27,6 +27,7 @@ install="
 	$pkgname.post-upgrade
 	"
 _pmb_groups="
+	feedbackd
 	seat
 	"
 _pmb_recommends="