To run rally on OSP18 and onward we need to have it in a container. As it's a standalone framework (not a tempest plugin), it makes sense to have it in a standalone container (not part of the tempest one).

The work required here should be analogical to tempest's one. Tempest container is built using tcib:

https://github.com/openstack-k8s-operators/tcib/tree/main/container-images/tcib/base/os/tempest

DoD:

• we have a rally container defined in tcib (similarly to tempest)
• we are able to run rally container on OSP18
• any unexpected failures are reported

Reviews:

• https://github.com/openstack-k8s-operators/tcib/pull/177