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regardless of the solution there is also a school of thought that Ingress should be as generic as possible and any app-specific configuration is anti-pattern

And where do I do the app-specific configuration then?

on app level. if app needs to authenticate incoming requests, it is it's responsibility to do that, maybe with the sidecar nginx, but still on the app pod

Sounds complicated, I'll have a look at this sidecar thingy