Add a script for updating gnome-desktop sources
Nautilus depends on thumbnail source code files from the gnome-desktop project. Therefore, when the upstream https://gitlab.gnome.org/GNOME/gnome-desktop project releases a new version of the files, they should be downloaded and merged into the nautilus project.
The script must download the latest gnome-desktop project files to the developer's local src/gnome-desktop folder.
Benefits of the solution
Reduce human error by automating the update of gnome-desktop source code into nautilus.
As with all changes, developers should be mindful to check the updated sources for sanity before submitting a merge request.