COSMIC App Store is built with PackageKit support

[sungsphinx]

COSMIC App Store is built with PackageKit support, but rpm-ostree doesn't support PackageKit, which means a lot of apps will show a "System" option, and when you try to install using it, it will fail.

Maybe there is some way to rebuild the store without the PackageKit feature on from this repo?

[p5]

Not sure if there's anything we can do to explicitly disable PackageKit support in the store, however you can get around the errors by adding Flathub as a user Flatpak repo. The App Store prefers Flatpaks over PackageKit for all packages except Steam and Lutris.
For Steam and Lutris, the App Store quietly falls back to Flathub after the PackageKit install fails.