Helm tool credentials management for private repo charts

[mogaika]

If I not mistaken, when using tk tool charts vendor you have to pass repo credentials via chartfile.yaml:

repositories:
- name: repo-private
  url: https://registry.___com/chartrepo/___
  username: XXXXXXXXX
  password: XXXXXXXXX

This is not acceptable from security perspective, since different users usually require different credentials and this way this file should be always modified and not commited.

Possible solution:
Add --repository-config (as in helm) to tk tool charts vendor to be able to use local ~/.config/helm/repositories.yaml. This way repositories management will be done by user and chartfile.yaml with tk tool charts vendor will be used only for charts management and there will be no need to pass auth parameters around to tanka. Feels more like workaround, but it's simple and preserves chart management of chartfile.yaml, especially considering that usually repo names and url associations are the same between different users anyways.