As a first step after yesterday's community meeting I've enabled koji-testing build in copr. It is a step ahead compared to my original "master" repo. So, now you can use:

Repo which uses master branch and is built once per four hours if there is anything new in git
https://copr.fedorainfracloud.org/coprs/tkopecek/koji/

Repo which uses master branch + merged all "testing-ready" PRs. This build is used by our internal QE for testing actual content. (Can be often broken due to automatic merging)

https://copr.fedorainfracloud.org/coprs/tkopecek/koji-testing/

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            Tomas Kopecek <tkopecek@redhat.com>
            RHEL Build Development, RedHat