[EKS] [CoreDNS]: Ability to select/provide CoreDNS image used in managed CoreDNS EKS Addon

[jacobneiltaylor]

Tell us about your request
A capability to either select from a series of supported CoreDNS images or provide a reference to an arbitrary CoreDNS image in the EKS-managed CoreDNS addon.

Which service(s) is this request for?
EKS

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?
We're currently investigating different options for cross-cluster service discovery using the MCS API.
According to your own AWS Cloud Map MCS controller intro post, a new CoreDNS image is required to use the multicluster CoreDNS plugin.
I've validated this is still the case with the current provided version of EKS-managed CoreDNS.
This exact case could be solved by adding the multicluster plugin to the EKS CoreDNS standard image, but I think a more generic solution would be helpful to the community.

Are you currently working around this issue?
Run a separate unmanaged CoreDNS instance with the required addons and use a forward rule for the clusterset.local domain using a custom Corefile.
This is fine for development/low volume but introduces additional complexity and point of failure.