Add option to authenticate against image repository

[mpryc]

Feature description

[commit time exporter]

Feature request is to add authentication against image registry for the container image type of exporter.

With #1030 we allow to run skopeo against self signed SSL registry endpoints by using cluster certificate mounted to the pod, however some registries requires authentication on top of SSL.

Possibly the ideal solution is to allow injecting auth.json so multiple registries can be added that requires authentication.

Because one running exporter instance may serve auth and non-auth images, it would be great if the fallback is to check without auth.

How this will help you

With skopeo image exporter type the auth will greatly improve usability in the env where registries are configured to use auth.

Feature priority

⌛ It will greatly improve my experience using Pelorus

Code of Conduct

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