workstation: Don't autostart gnome-software on live media

gnome-software session service automatically downloads yum metadata,
which all goes to the RAM-backed filesystem overlay when running the
live image. This is undesired as it can make it difficult to install
Workstation on low memory devices.

To fix this, this commit disables gnome-software xdg autostart service
and the gnome-shell search provider on the live media.

https://bugzilla.redhat.com/show_bug.cgi?id=1560504

fedora-live-workstation.ks

@@ -17,12 +17,20 @@ part / --size 6656
 cat >> /etc/rc.d/init.d/livesys << EOF
 
 
-# disable updates plugin
+# disable gnome-software automatically downloading updates
 cat >> /usr/share/glib-2.0/schemas/org.gnome.software.gschema.override << FOE
 [org.gnome.software]
 download-updates=false
 FOE
 
+# don't autostart gnome-software session service
+rm -f /etc/xdg/autostart/gnome-software-service.desktop
+
+# disable the gnome-software shell search provider
+cat >> /usr/share/gnome-shell/search-providers/org.gnome.Software-search-provider.ini << FOE
+DefaultDisabled=true
+FOE
+
 # don't run gnome-initial-setup
 mkdir ~liveuser/.config
 touch ~liveuser/.config/gnome-initial-setup-done