This commit switches the default repositories to use the build-in
ones from images PR#1112. It is still possible to override using
`/etc/image-builder` and `/usr/share/image-builder` or `--datadir`.
This is implicitly tested via the container test that no longer
includes the files from osbuild-composer in the container.
This commit moves the smoke test from fedora-41 to centos-9. The
reason is that it seems the fedora mirrors in general are a bit
more flaky so /hopefully/ the centos one will help.
The real fix of course is to retry different mirrors on failure,
we will need to look into librepo integration in osbuild (again)
for this (hopefully soon!).
This commit adds a smoke test that builds the ibcli container
and runs a fedora-41 raw-minimal build to double check that
the container based building actually works.
Thanks to Ondrej for suggesting this.
