?
It's certainly possible in BuildMaster, but it's not a common workflow anymore. We have considered extending support, but the market generally is moving towards "many single-purpose tools" than "multi-function tools". The general flow these days looks like this:
Source >> CI >> Package >> Deploy
In this case, ProGet is the Package repository and BuildMaster is the deploy tool. The advantage to this workflow is that, the CI tool need only "create a validated package", instead of trying to deploy.
By the way, I also recommend you to look at GitLab; we switched to it after extensive evaluations of similar "simple" tools (GitHub, BitBucket), as well as the enteprrise tools (Perforce, etc).