Add 'gitea_api' module and 'git-obs' executable #575

Job	Run time
unit - read only fixtures	18s
unit (registry.fedoraproject.org/fedora:38)	53s
unit (registry.fedoraproject.org/fedora:39)	55s
unit (registry.fedoraproject.org/fedora:rawhide)	32s
unit (registry.opensuse.org/opensuse/leap:15.3)	1m 30s
unit (registry.opensuse.org/opensuse/leap:15.4)	1m 36s
unit (registry.opensuse.org/opensuse/leap:15.5)	1m 15s
unit (registry.opensuse.org/opensuse/tumbleweed)	1m 0s
unit (quay.io/centos/centos:stream9)	45s
unit (docker.io/library/debian:stable)	30s
unit (docker.io/library/debian:unstable)	28s
unit (docker.io/library/ubuntu:latest)	35s
behave	15m 28s
	25m 45s

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