[proposal] Support for multiple values files for a helm release

[stevenbarragan]

I'm trying to use skaffold with helm secrets and besides other things it generates a decrypted yaml file to pass to helm, for example to do an upgrade.

helm upgrade -f values-file.yaml -f decrypted-values-file.yaml.dec ...

Actual behavior

...
deploy:
  helm:
    releases:
      - chartPath: chart
        valuesFilePath: chart/values-qa.yaml
...

Proposed behavior

...
deploy:
  helm:
    releases:
      - chartPath: chart
        valuesFilePath:
          - chart/values-qa.yaml
          - chart/other-values.yaml
...

Each file under the valuesFilePath will be passed to helm.

I dig into the code, it seems kind of straight forward but I'm not too familiar with go, it seems that the part that needs to be updated will be helm.go#L146, is there a way to set this key to either an string or an array and make it work both ways? if not, should we add a valuesFilePaths to support an array since it'd a breaking change?

[RoryShively]

I just opened an issue to continue the work on getting helm-secrets to work with skaffold
#1178

[nkubala]

This was fixed through #985!