Bug: Proxy with private repository

[Despire]

Current Behaviour

It seems that the proxy settings does not seem to work well when downloading images from private repositories.

Expected Behaviour

Downloading images from both public and private repositories should work.

[bernardhalas]

By its own very nature, the installation proxy service has a whitelist of domains that it's allowed to open outgoing connections to. In this whitelist we currently maintain the necessary upstream artifactories, registries and repositories that are necessary for spawning a Kubernetes cluster successfully.

Of course, if one wishes to use private image registry, the expectation is that it's not whitelisted by default (as it can be hosted on any arbitrary hostname). Therefore, private registry URLs need to be added to proxy whitelist on request by Berops engineering team.