We used to run XAML Builds, there you could start one Build from another, for example let a GC run an Integration Test workflow afterwards and so on.
In VNext there is no way to trigger other Buils. How can we make this happen?
This Feature is under plan, but don't have yet.
Check this User Voice, and the QA on this website:
Can I chain builds so that one build triggers another?
Not yet.