Hey there 
Just checked the file "trusted.gpg". There are some keys stored in it.
I cannot tell whether my system needs them or not.
Are you sure that /usr/share/keyrings/ is the correct folder? I thought "trusted.gpg.d" is the correct one, but who am I to tell.
Well I tried this on a different machine yesterday. With a fresh installation of 22.04. Before installing the .deb-file I checked the the folder "/etc/apt/ on that machine. The file "trusted.gpg" was missing there.
But the "trusted.gpg" file has been created during the installation of the respective .deb-file.
So this problem exists for all users, I suppose.
Again, in my opinion this should be fixed under the hood and not by the users.
Thanks for your efforts!
Greetings.