systemd/gdm: fix logging into user-mode

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8189>

extra-repos/systemd/gdm/APKBUILD

@@ -5,7 +5,7 @@ maintainer="Newbyte <newbyte@postmarketos.org>"
 pkgname=gdm
 _pkgver=50.0
 pkgver=9999$_pkgver
-pkgrel=0
+pkgrel=1
 pkgdesc="GNOME display manager"
 url="https://gitlab.gnome.org/GNOME/gdm"
 # blocked by gnome-shell
@@ -47,6 +47,7 @@ source="https://download.gnome.org/sources/gdm/${_pkgver%%.*}/gdm-$_pkgver.tar.x
 	0003-DOWNSTREAM-pam-rename-common-to-base.patch
 	disable-userdb.patch
 	gdm.sysusers
+	gnome-login-session.patch
 	"
 install="gdm.pre-install gdm.post-deinstall"
 builddir="$srcdir/gdm-$_pkgver"
@@ -82,4 +83,5 @@ e4236564014dd79d9369e56be0933278811ae276e6296b580e4b724b3f7fb2f1209b886230fb5913
 66611d49fc4c9578415a7e554834edcb9de99396bd0ca511dcfd4fb256e8a1cd1fd5f10464f4668ffe04799d919bc22ddb58e8bf272017edba69a7951522e63d  0003-DOWNSTREAM-pam-rename-common-to-base.patch
 4cbaf87896c6d890b5bdbdf13ee31c81b3cdbcba44cd8a48606268f28202fd775361c9507a503d680c70ba49eff00b896935942daf8615f434b903ae0e76fe20  disable-userdb.patch
 cdac8a8d0563f050ed7b8f4d31ea085ae24550bd99ab57ed4f3469723aea2bdcdb92330b625a96e4e366a8c3334d3b7657e0fafe9b914df6f846ea2bd0be22ec  gdm.sysusers
+96bb63304b8b728930166b157d48e01baf90947a85e6802010ee6541c3cdcf5f5df7fdc0e3a51a81985c6a398215b978825188364191c8325f84db1a562605ab  gnome-login-session.patch
 "

extra-repos/systemd/gdm/gnome-login-session.patch

@@ -0,0 +1,26 @@
+From 33fb8b6bbce155a78a7499fc6ff30af133aa6ed6 Mon Sep 17 00:00:00 2001
+From: Achill Gilgenast <achill@achill.org>
+Date: Mon, 16 Mar 2026 14:51:16 +0100
+Subject: [PATCH] data: Add --session gnome-login to gnome-greeter.desktop
+
+Otherwise it logs into user-mode of user gdm-greeter.
+---
+ data/gnome-greeter.desktop.in | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/data/gnome-greeter.desktop.in b/data/gnome-greeter.desktop.in
+index fded368fe..0f810662b 100644
+--- a/data/gnome-greeter.desktop.in
++++ b/data/gnome-greeter.desktop.in
+@@ -1,7 +1,7 @@
+ [Desktop Entry]
+ Name=GNOME Greeter
+ Comment=The default GNOME Greeter session
+-Exec=gnome-session
++Exec=gnome-session --session gnome-login
+ TryExec=gnome-session
+ Type=Application
+ DesktopNames=GNOME-Greeter:GNOME
+-- 
+GitLab
+