Running the ros_buildfarm on Windows is not a use case we designed for. I would not recommend attempting to make this work.
We do a lot of work in docker but there are many scripts that run bash to launch the docker instances.
The buildfarm_deployment is very much tied to posix. It's certainly possible to consider running it on other posix platforms, but the only tested platform is Ubuntu. If you're setting up a buildfarm it's highly recommended to have dedicated machines and to use the standard ubuntu base images.