Comment 1 for bug 1936825

did some digging today and found that bug [1] which i believe is describing the same issue
There is a github issue at [2]. There was a fix at [3] but that is not currently on train so I had a go at cherrypick with [4] being tested at [5].

From the failing job [6] you can see the registries.conf looks like

# insecure registry list
[registries.insecure]
registries = ['undercloud.ctlplane.localdomain', '192.168.24.1', '192.168.24.3']

With the patch at [4] it should end up looking more like [7] (wallaby job)

# insecure registry list
[[registry]]
prefix = "undercloud.ctlplane.localdomain"
insecure = true
location = "undercloud.ctlplane.localdomain"

[1] https://bugs.launchpad.net/tripleo/+bug/1909658
[2] https://github.com/containers/podman/issues/5764
[3] https://review.opendev.org/c/openstack/tripleo-ansible/+/719584
[4] https://review.opendev.org/c/openstack/tripleo-ansible/+/801615
[5] https://review.rdoproject.org/r/c/testproject/+/34621
[6] https://logserver.rdoproject.org/openstack-periodic-integration-stable3/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-8-undercloud-upgrade-ussuri/049bb37/logs/undercloud/etc/containers/registries.conf.txt.gz
[7] https://logserver.rdoproject.org/openstack-periodic-integration-stable1/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-8-undercloud-upgrade-wallaby/ed2950e/logs/undercloud/etc/containers/registries.conf.txt.gz