Support for custom Args on deployment spec

[thiagosalvatore]

Describe the solution you'd like

This helm template already offers us the possibility of overriding the ENTRYPOINT from the Dockerfile by using the containerCommand input variable. It is super nice, but there are situations in which I don't want to override the entrypoint, but I want to pass custom arguments to my container using the args provided by kubernetes (the CMD in the Dockerfile). For reference: https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#use-environment-variables-to-define-arguments

Is there a reason why it is not implemented? It should be something simple to do and I'm happy to open a PR with that.