8f0906b osbuild: support specifying `package_sets` for repos

Authored and Committed by thozza a year ago
    osbuild: support specifying `package_sets` for repos
    
    The `koji-osbuild` plugin supports additional formats for the `repo`
    property since v4 [1]. Specifically, a repo can be specified as a
    dictionary with `baseurl` key and `package_sets` list containing
    specific package set names, that the repository should be used for.
    
    Extend the configuration schema to reflect the plugin change.
    Extend the documentation to cover the new repository format.
    Extend an existing unit test to specify additional repository using the
    added format.
    
    [1] https://github.com/osbuild/koji-osbuild/pull/82
    
    Signed-off-by: Tomáš Hozza <thozza@redhat.com>
    
        
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