I have had success using Travis-CI for this as well. They have experimental support for Windows builds now, and I have more experience with Travis than with the Azure suite so I gave it a try.
Here’s the travis.yml for one of my in-progress plugins. It has a couple things that may be superfluous for a more basic plugin as it has a bunch of dependencies to install and compile first, but removing or changing the apt/brew package lists should be all that’s needed to make it more generic.