You must have gone through multiple thoughts on how to handle the requirement, but the biggest problem that I am able to see here is a dependency on a certain platform for executing Powershell scripts. Next is being a developer will never suggest having Powershell or bash as a backend of your system until it is related to some IoT Stuff. In place of it, I would rather suggest you use Infrastructure as a Code that comes with terraform or Ansible or as your application is based on Azure so u can use Azure Resource Manager too.

Adding to it for making config or attaching a trigger to these infrastructure controllers, you can use lightweight stateful APIs with the help of flask or express or go-mux, to keep track on the progress of deployments.