Automatically update supported GNOME Shell versions by parsing metadata.json
@tobi This simplifies the work needed for new GNOME Shell versions or extension updates.
I copied this from gnome-shell-extension-flypie
To apply this to gnome-shell-pomodoro, you probably would just need to change the debian/rules path to plugins/gnome/extension/metadata.json.in
. You don't need to add a python3 Build-Depends since meson already pulls in python3.