Support Kolla image tags overrides per environment #6605

Job	Run time
Tox pep8 with Python 3.12	29s
Tox releasenotes with Python 3.12	28s
Ansible 2.18 lint with Python 3.12	1m 51s
Ansible 2.17 lint with Python 3.10	1m 55s
Tox docs with Python 3.12	34s
Check changed files	4s
Build Kayobe Image / Build kayobe image	4m 36s
Check container image tags / Check container image tags	2m 44s
aio (Ubuntu Noble OVN) / runner-selection / define_runner	5s
aio upgrade (Rocky 9 OVN) / runner-selection / define_runner	3s
aio upgrade (Ubuntu Jammy to Noble OVN) / runner-selection / define_runner	3s
aio (Rocky 9 OVN) / runner-selection / define_runner	3s
aio (Rocky 9 OVS) / runner-selection / define_runner	3s
aio upgrade (Rocky 9 OVS) / runner-selection / define_runner	2s
aio upgrade (Rocky 9 OVS) / All in one	1h 5m 12s
aio (Rocky 9 OVS) / All in one	1h 24m 44s
aio (Rocky 9 OVN) / All in one	1h 28m 22s
aio upgrade (Ubuntu Jammy to Noble OVN) / All in one	2h 31m 25s
aio upgrade (Rocky 9 OVN) / All in one	1h 4m 20s
aio (Ubuntu Noble OVN) / All in one	1h 40m 29s
	9h 27m 32s

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