I am new into Mac OS server and I have found possibilities that come with Xcode integration. I need a machine that will work ONLY as a server for building small Xcode projects. Which Mac mini model will be the best for my needings? Like I said Mac mini will be used only for server Xcode builds + upload to App Store so I don't want to buy overpay. On the other hand I would like to use these machine for at least year or two so I should be able to handle newer versions of Xcode. I consider used Mac as well. I am using Xcode 8 and swift 3.0.