Include ublue-os/config

[RoyalOughtness]

These images are missing out on ujust commands, container policy, etc :)

[idnovic]

Ignore

I tried to create a working PR.

I followed the [guide](https://github.com/ublue-os/config/blob/main/README.md) of ublue-os:config to add the missing files (udev rules, ...) to the build process.

But it fails. Someone else needs to take a look at it.

[idnovic]

downstream issue is that at secureblue the comsic image variant does not build anymore because policy.json is missing. We suspected that ublue-os:config is not included. Currently it looks like the cosmic variant does not included this commit ublue-os/config@bfd1b68

[fiftydinar]

Something funky's going on with ublue-os-signing RPM package.

It is also reported that this error can be shown:
cp: cannot stat '/usr/share/ublue-os/cosign.pub': No such file or directory

However, that error is inconsistent, since it appears for some people, while for some not.

blue-build/modules#317

Maybe builds are broken from bad GitHub builders?

[fiftydinar]

The error above is fixed when copying keys to /usr/etc/ instead to /etc/ in BlueBuild CLI.