RKE2, enable "conditional image import"

Thomas Morinrequested to merge
rke2-conditional-image-import into main

This MR creates the ".cache.json" file to enable "Conditional Image Imports".

https://docs.rke2.io/install/airgap?airgap-load-images=Manually+Deploy+Images&installation-methods=Script+install#enable-conditional-image-imports

This is a small & cheap optimization to avoid a useless import of all container images at each RKE2 restart.

Edited by Thomas Morin

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