This allows for doing stuff like this on the custom resource:
```
security_context_settings:
runAsUser: 1000
runAsGroup: 0
```
I added `snakeCaseParameters: False` because without it, variables like `runAsUser` become `run_as_user`... and that doesnt work.
With some kubernetes clusters and settings, you might need to specify
some capabilities so the container can start. For example, the CHOWN,
SETUID and SETGID capabilties.
Setting the redis_capabilities option will add the capabilities in
the deployment.
