This means that the unit tests no longer need to load the
repositories from the git repo, and in a follow-up, osbuild-composer
won't need to either.
By splitting the repositories used for testing from the system
repositories available through the weldr API we are able to extend
the system repositories without affecting the reproducibility of
the tests.
Signed-off-by: Tom Gundersen <teg@jklm.no>
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