Suggestion for improvement: Check architecture

[pepoweb]

First of all, thanks for this script. After running into issues installing k3s for the past 4 days I now have a running cluster!

Since I have a jump host on a Raspberry Pi, I first used that to run the script from which start to create more and more errors.
Luckily on the first line after "k3sup not found, installing" there was a good hind: armv7

I spun up an additional machine on PME, copied the files there and ran it again, and... SUCCESS!

I would suggest to have some sort of check on the architecture of the installing host and the machines that are being installed. Not sure how, just a suggestion. Or at least have a warning in the script or the howto.