[helm-values] support name as alias for repository

What would you like Renovate to be able to do?

Some helm charts are using name instead of repository for the image name. see https://github.com/containous/traefik-helm-chart/blob/98f4575d75b91c6e739ebc0e75c720c998f7dd38/traefik/values.yaml#L3

# Default values for Traefik
image:
  name: traefik
  tag: 2.2.8
  pullPolicy: IfNotPresent

Did you already have any implementation ideas?

sure, simply allow name as alias for repository

Are there any workarounds or alternative ideas you've tried to avoid needing this feature?

yes, simply add the repository key too.

# Default values for Traefik
image:
  name: traefik
  repository: traefik
  tag: 2.2.8
  pullPolicy: IfNotPresent

Is this a feature you'd be interested in implementing yourself?

sure