Add support for the registry value in the autodiscovery for helm

[mavimo]

Is your feature request related to a problem?

I'm experimenting the auto-discovery feature helm.

I see that work fine using the tag and repository entry but only if the repository include also the registry entry, when they are defined in different entries (that seems to be the most used approach) is not able to work.

E.g.:

image:
    tag: 1.0.0.
    repository: quay.io/foo/bar

work fine, but:

image:
    tag: 1.0.0.
    registry: quay.io
    repository: foo/bar

fail since use the default registry (hub.docker.io) instead the one specified in the registry.

Solution you'd like

Add support also for the registry entry

Alternatives you've considered

Do some manipulation in the yaml before and after using updatecli to woraround the problem

Anything else?

I already have some code working, I'll open a PR soon