creq: Allow to specify source and target repository #572

Job	Run time
unit - read only fixtures	19s
unit (registry.fedoraproject.org/fedora:38)	54s
unit (registry.fedoraproject.org/fedora:39)	52s
unit (registry.fedoraproject.org/fedora:rawhide)	31s
unit (registry.opensuse.org/opensuse/leap:15.3)	1m 23s
unit (registry.opensuse.org/opensuse/leap:15.4)	1m 40s
unit (registry.opensuse.org/opensuse/leap:15.5)	1m 14s
unit (registry.opensuse.org/opensuse/tumbleweed)	1m 0s
unit (quay.io/centos/centos:stream9)	50s
unit (docker.io/library/debian:stable)	27s
unit (docker.io/library/debian:unstable)	30s
unit (docker.io/library/ubuntu:latest)	27s
behave	16m 28s
	26m 35s

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