feature: support external etcd in CacheServer

[gman0]

Feature Description

The CacheServer resource should be able to accept an external etcd store.

Proposed Solution

Add a (etcd?) data store reference to the CacheServer spec, and pass it to the cache-server command like so:

  --etcd-servers <Comma separated list of nodes> \
  --etcd-cafile <Path to the CA PEM file from the mounted Secret> \
  --etcd-certfile  <Path to the Certificate PEM file from the mounted secret> \
  --etcd-keyfile <Path to the Key PEM file from the mounted secret>

Alternative Solutions

No response

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Additional Context

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