A quad core (celeron) with 8GB RAM is good enough for a roon core.
Iโm running a VM with 2 cores/2GB RAM and I have no performance issues. Thatโs a lesser machine than what you intend to use
If you install a Fedora 39/40/41 in that box, you could run my installer script from here. I made it to run in a VM but any fresh fedora install would work.
I believe you should find ubuntu/debian scripts like mine around if you go for one of those.