Chart does not support securityContext on pod and container

[ankit-ls]

Summary

Helm chart does not provide option to set securityContext on either pod or container. We would like to be able to set securityContext via values.yaml.

Motivation

https://kubernetes.io/docs/tasks/configure-pod-container/security-context/#set-the-security-context-for-a-pod

Proposal

Please add this config option in deployment.yaml so that we can start using it via values.yaml.