Feature Description

Following https://docs.google.com/document/d/18Xh2-VFnH23bDiAHPP_JXm4qAG4QK6GjTKcpszPGApQ/edit?tab=t.0

Epic: #3292

We need to add a replication API to the core. The goal of the API is to enable the use of replicating objects based on resources into the cache server. The replicated object should be backed by the replication object and identity, and be able to be served via virtual workspace using the Replication identity.

Proposed Solution

Add an API:

apiVersion: cache.kcp.io/v1alpha1
kind: PublishedResource
metadata:
  name: instances
spec:
  resource: instances.corp.com
  identity:
    secret:
    namespace:
  labelSelector:
    tier: premium 
status:
  identityHash: supersecrethash

It would pick resources in the same workspace where the object is and replicate them into the cache server.

Once this is replicated, we would need to create a dedicated VirtualWorkspace and serve these when it is referred in the APIExport. (Separate ticket)

Alternative Solutions

No response

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Additional Context

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