provisioning: include instructions for RPI3#784

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sbaeurle wants to merge 1 commit intocoreos:mainfrom

sbaeurle:patch-1

Commits on Jan 7, 2026

include RPi3 Instructions from https://discussion.fedoraproject.org/t/fcos-unusually-slow-on-raspberry-pi-3b/40635/16
sbaeurle
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