Remove need to use dockerhub for tests

**Describe the problem/challenge you have**
We are currently failing the tests due to rate limiting on Dockerhub

**Describe the solution you'd like**
We should stop relying on Dockerhub to have our e2e tests running in CI.

**Anything else you would like to add:**
Use a local registry like registry:2 or something similar. If we want to keep some tests that involve Dockerhub they should be scoped down to ensure that we do not get rate limited.

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The issue names no specific files or tests. Start by locating the e2e test setup and CI configuration, then trace where Dockerhub images are pulled; done means CI tests use a local registry without Dockerhub rate-limit failures, while any retained Dockerhub tests are scoped down.

Written by the indexing model from the issue text.