Investigate test instability in SDK CI

[baronfel]

Describe the bug

We have a re-occurring test failure in the SDK CI that's captured here - we should mitigate this. The tests that fail are ones that interact with a local registry - we should consider finding ways to mitigate the failure spawning the container with the local registry. Some options to do this might be:

• spawn the registry via podman
• retry the registry spawning/more validations in the spawning stage
• find a trusted externally-available registry that we could use in lieu of spawning
• split the registry-container tests into a separate CI run for a) speed and b) stability of other test legs