nodepool: Add Fedora CoreOS (stable, testing, next)

Rolv Apnesethrequested to merge
Rolv-Apneseth/sf-config:add_fedora_coreos into main

Originally opened an MR here: https://softwarefactory-project.io/r/c/config/+/35128

I'll include the context originally posted there too:

For context, I'm with the CoreOS team and I'm here from https://github.com/containers/toolbox/issues/714

Disclaimer: this was largely LLM generated, but I believe I've adequately tested and confirmed these changes should work as expected. However, I am of course not very familiar with this code base so apologies in advance if I've missed anything. Happy to make any changes.

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