Helm release should not create extra release but attach changes to existing chart release

[meffmadd]

Is your feature request related to a problem? Please describe.
The helm release action creates a new GitHub release each time we create a chart release, which itself is a GitHub release. This is ugly.

Describe the solution you'd like
The release action should modify the existing chart release instead of creating a new release since it only adds an asset (.tgz) file.

Apparently not possible for now: https://www.github.com/helm/chart-releaser/issues/122

But at least use --make-release-latest false