Support Kolla image tags overrides per environment #6588

Job	Run time
Ansible 2.17 lint with Python 3.10	1m 51s
Tox docs with Python 3.12	28s
Tox releasenotes with Python 3.12	29s
Tox pep8 with Python 3.12	28s
Ansible 2.18 lint with Python 3.12	1m 53s
Check changed files	4s
Build Kayobe Image / Build kayobe image	6m 36s
Check container image tags / Check container image tags	2m 52s
aio (Rocky 9 OVN) / runner-selection / define_runner	4s
aio upgrade (Ubuntu Jammy to Noble OVN) / runner-selection / define_runner	4s
aio (Ubuntu Noble OVN) / runner-selection / define_runner	6s
aio upgrade (Rocky 9 OVS) / runner-selection / define_runner	5s
aio (Rocky 9 OVS) / runner-selection / define_runner	3s
aio upgrade (Rocky 9 OVN) / runner-selection / define_runner	4s
aio (Rocky 9 OVS) / All in one	1h 38m 0s
aio upgrade (Ubuntu Jammy to Noble OVN) / All in one	2h 33m 52s
aio upgrade (Rocky 9 OVN) / All in one	1h 48m 9s
aio (Rocky 9 OVN) / All in one	1h 12m 15s
aio upgrade (Rocky 9 OVS) / All in one	1h 38m 10s
aio (Ubuntu Noble OVN) / All in one	1h 57m 11s
	11h 2m 44s

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