Running CI for Iphone / Ipad dev?

20 years ago the company I worked for used a Mac-Mini for video transcoding, because there was some DRM issue we had to deal with, I don't remember the specifics.

It's not strictly speaking a server even. Just a rented personal computer.

running macOS, which runs Xcode, which is required for making and signing iOS and macOS apps, Witcher, then sold on the App Store for money dust justifying spending money on their, or a similar service.

Generally the main purpose was CI, blockchain mining and AI training

MacOS dev and CI.

To compile and test software for Mac.