Ensure /etc/dconf/db/gdm is generated at install time

This avoids warnings in the log from login screen

gdm.spec

@@ -11,7 +11,7 @@
 Name: gdm
 Epoch: 1
 Version: 40.0
-Release: 4%{?dist}
+Release: 5%{?dist}
 Summary: The GNOME Display Manager
 
 License: GPLv2+
@@ -90,6 +90,8 @@ Requires: xorg-x11-xinit
 # use a user bus
 Requires: /usr/bin/dbus-run-session
 
+Requires(posttrans): dconf
+
 Provides: gdm-libs%{?_isa} = %{epoch}:%{version}-%{release}
 
 %description
@@ -227,6 +229,9 @@ fi
 %postun
 %systemd_postun gdm.service
 
+%posttrans
+dconf update || :
+
 %files -f gdm.lang
 %doc AUTHORS NEWS README.md
 %license COPYING
@@ -302,6 +307,10 @@ fi
 %{_libdir}/pkgconfig/gdm-pam-extensions.pc
 
 %changelog
+* Wed Jun 16 2021 Ray Strode <rstrode@redhat.com> - 40.0-5
+- Ensure gdm dconf db is generated at install time
+  Related: #1972234
+
 * Tue Jun 15 2021 Ray Strode - 1:40.0-4
 - Provide gdm specific dconf sources
   Related: #1972234