Is your feature request related to a problem? Please describe.

Allow securityContext fields such as runAsUser, runAsGroup, and allowPrivilegeEscalation to be set on agones-{allocator,extensions,controller,ping,sidecar}

https://kubernetes.io/docs/tasks/configure-pod-container/security-context/

Describe the solution you'd like
Helm chart change

Describe alternatives you've considered
You can do this with kustomize.