main/postmarketos-ui-gnome: disable for armhf (!1015)

gdm is missing in Alpine for armhf [ci:skip-vercheck]

Related: https://builds.sr.ht/~postmarketos/job/160896

main/postmarketos-ui-gnome/APKBUILD

@@ -3,9 +3,10 @@
 pkgname=postmarketos-ui-gnome
 pkgver=1
 pkgrel=0
-pkgdesc="(Wayland) Gnome Shell"
+pkgdesc="(Wayland) Gnome Shell (not for armhf)"
 url="https://gnome.org/"
-arch="noarch"
+# armhf: gdm missing
+arch="noarch !armhf"
 license="GPL-3.0-or-later"
 depends="polkit-elogind gdm gnome xorg-server-xwayland postmarketos-artwork-wallpapers kgx"
 install="$pkgname.post-install $pkgname.post-upgrade"