Recently, a new hook was created for adding custom certificates to the test-operator pods [1]. Now, we need to document the new code downstream, so it is known how it should be used.

[1] https://github.com/openstack-k8s-operators/ci-framework/pull/3023

DoD:

• The new hook is documented downstream.

Reviews:

• https://gitlab.cee.redhat.com/ci-framework/docs/-/merge_requests/176