RFC: add gnupg2-scdaemon to ostree variants?

Background: Since Changes/Modular GnuPG Packaging, GnuPG is no longer one monolithic package, but optional components are split off into separate subpackages. When I made this change, I made sure that on upgrade to Fedora 43, all components that were previously installed by default on Fedora <43 would continue to be installed, but fresh installs of Fedora 43 would get a more reasonable "widely used tools only" package / component set.

However, this "keep installed components the same on upgrade" mechanism does not apply to OSTree based variants, which I had not considered when working on this Change. This is causing unexpected regressions in functionality for users on ostree variants who use SmartCards / Yubikeys / etc. when upgrading to Fedora 43 (see https://discussion.fedoraproject.org/t/170981 for an example thread).

I am not planning to add gnupg2-scdaemon back to the default package set on non-ostree variants - they are not affected by this issue. But on ostree variants, this is a regression for users on upgrade from Fedora 42 (and installing gnupg2-scdaemon to get this functionality back requires layering it, which isn't very nice).

I am not sure $SUBJECT is even the best / "correct" solution here, hence "RFC".