Create a new KojiSource custom resource, this resource should setup an external repository for a given tag in Koji.

It also needs to reflect the status of the external repo sync.

It should fail if the tag is not present.

Suggested resource schema:

apiVersion: buildsys.apps.fedoraproject.org/v1alpha1
kind: KojiSource
metadata:
  name: default
  annotations:
    buildsys.apps.fedoraproject.org/hub: sample/osdk-test
  spec:
    url: https://mirrors.kernel.org/fedora/releases/32/Everything/$arch/os/
    tag: dist-kube-build

Secrets, username, and etc should use the resource name and namespace where applicable.