[kubernetes] Add extra pod config for Gateway services

[jhamman]

It is currently possible to add arbitrary kubernetes configuration to the scheduler and worker objects via extraPodConfig. Is there a way to do this for the core Gateway services (api, controller, proxy)?

cc @TomAugspurger

[gforsyth]

Hey @jhamman -- for the core services, does it make sense to edit the helm chart directly?

[consideRatio]

There is traefik.service.spec, but there isn't one for gateway.service.spec. There are only the traefik and api services though, the controller doesn't expose itself via a service.

Action point

• Decide if the point below is an acceptable implementation or not
• Add gateway.service.spec mirroring how its done at traefik.service.spec, that augments the spec of the k8s Service rather than merge it - something that would require a major cluttering of the Helm templates.