Have you tried Visual Studio Online (or Visual Studio Team Services, as it is now called), for build automation? Or you have just ignored it considering it's for .NET developers? Well, if you have ignored it, this is the time to revisit that thought!
It's a complete ALM for all developers, and it's free on cloud with unlimited private Git repos.
What's interesting is that it also provides build beatures for cross platform applications, VSTS (TFS 2015) has a new and much powerful build engine than TFS 2013 and you can now configure build automation for NodeJS, Java, Android, XCode, and .NET.
The video recording below is a quick 15 minute guide to configure cross platform build automation with VSTS or TFS 2015 (on-prem)
Hope this helps you!