Change the type of custom action to JS based action

[Anmol1696]

Overview

We need 2 features of the JS based action, which is pre and post step. We use these to cleanup helm charts before and after the cleanup.

https://docs.github.com/en/actions/creating-actions/creating-a-javascript-action

Proposal

We still use bash scripts for the actual execution, but invoke the bash scripts via the JS module.

Note: Effort is non trivial since we might not be able to use the already existing actions.

[Anmol1696]

This is a good example of exactly what we want: https://github.com/helm/kind-action

[Anmol1696]

Closed by: #25