Bazzite (Fedora atomic): install virtualbox from RPM fusion

Bazzite has rpm fusion repositories added in /etc/yum.repos.d/. However, even though they are enabled, by default you can't install any packages from them. You can force the use of the RPM repo as follows:

sudo dnf --enablerepo=rpmfusion-free install virtualbox
This will still not install the virtualbox in atomic fedora as its read-only system. But can be useful for building custom atomic images which would contain the virtualbox or other packages.