Request: default a runner's extraPodSpec to the BentoDeployment's value when it's not explicitly set

[mqk]

Bentos can contain many runners. Currently if one wants all runners to have the same extraPodSpec (for example to set a toleration) you have to specify it separately for each runner. It would be convenient if the runners could instead "inherit" a default value of extraPodSpec from the parent BentoDeployment. My concrete use case for this is that I would like all bento-related pods (both service and all of its runners) to be running on a non-default k8s node pool, which I can achieve by adding a toleration. However, in the current set-up it needs to be done "manually" for the service and each of the runners.

I'm not 100% confident that this is right, but it looks to me like here is where the runner's extraPodSpec is set. If we only did that assignment if runner.ExtraPodSpec was non-nil, then the previously defined value (from opt.bentoDeployment.Spec.ExtraPodSpec, l.2501) would instead be used. I think that would do what I'm asking for.

Any thoughts about this solution?