Affinity or node selector for kaniko pod

[azagarelz]

Is your feature request related to a problem?
Yes, the documentation seems to suggest that we can't specify a kind of affinity for our kaniko build pods and this makes hard to force the scheduling of such pods on a set of dedicated nodes

Which solution do you suggest?
Add a configuration option in case of kaniko build engine, that let people specify an affinity or at least a node selector for the kaniko pod

/kind feature

[FabianKramm]

@azagarelz thanks for opening this issue! Yes I think we can add that to the config

[FabianKramm]

@azagarelz images.*.build.kaniko.nodeSelector was added in v5.5.0