Helm values support

[miskr-instructure]

Currently the doppler operator chart cannot be customized at all via values.yaml. The one in the chart is empty, and the chart has no go templating in it, so the manifests are all hardcoded YAML files.

The following things should be configurable via values.yaml:

• manager container args (eg. to add --zap-log-level or any other arguments)
• manager container resources
• manager pod/container securityContext
• (extra) manager deployment/pod annotations and labels

It looks like there is a prototype of what we'd like here: #61