init-cache should use same cache for host and VM

[DemiMarie]

How to file a helpful issue

The problem you're addressing (if any)

Having separate package caches for host-DIST and vm-DIST slows down downloads, wastes disk space, and provides no benefit.

The solution you'd like

Share caches between host-fcX and vm-fcX.

The value to a user, and who that user might be

All contributors who build packages for both host and guest will benefit from not having to run init-cache as often.

Completion criteria checklist

(This section is for developer use only. Please do not modify it.)

[marmarek]

No, this is bad idea. They are not the same. They have different repositories (or local package sets), which is especially relevant with #9703. For example host-DIST will have our Xen packages, while vm-DIST will have Xen packages from given distribution repos.

[github-actions]

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