Continuous Integration infrastructure for multiple iOS projects As a iOS developer, I was looking to create a CI and CCQ (= Continuous Code Quality) infrastructure for the iOS projects we have in development so far. We already use Jenkins and SonarQube for almost all the Web and Android projects (using a VM foreach project, installing and configuring the CI and CCQ is automated) and it works great. But for the iOS projects, Jenkins needs to do the build on a computer running macOS, so I am not sure I have the perfect solution for that. 


I was looking into a solution to virtualise the macOS. For each
project, to create a virtual macOS and install Jenkins as slave there
to handle the builds. The solution looked perfect, but it seems it is
not legal to have more than 2 VM running with macOS (and of course,
only on Mac computer)
http://images.apple.com/legal/sla/docs/macOS1012.pdf -> The point
2.B. So this isn't a solution for my case.
Another common solution I've read about is to have a Mac computer
(maybe a MacMini) that will handle all the builds for all the
projects. What do you think about this implementation? How many
projects may it handle? Developers may need to do some configurations
on their own project (especially in SonarQube), is it safe? 
Can we have multiple Jenkins and SonarQube instances on the same machine, using different ports? Is this even a solution to be considered or I am talking non-sense?
Is there any other viable solution, maybe better than the ones above :) ? 


Note: I am not sticking to Jenkins + SonarQube duo, if there are any other tools better suitable for iOS development, please share them with me.
Is there any other viable solution, maybe better than the ones above :) ?


For Jenkins probably no, due to the license issues you mentioned (you have to run macOS on Apple branded hardware). If you can work with that then it's definitely a solution.

If not, then I'd suggest you to check for a hosted iOS continuous integration system where you don't have to deal with the Apple hardware / licensing, the service will manage it for you, e.g. https://www.bitrise.io

There are also services where you can rent Apple hw and you can configure it any way you like, https://www.macstadium.com is one of them (probably the biggest one).