It sounds like you're describing Kubernetes. It already does container and volume management that way. All that's left is to continue building on top of it so that it can provision managed services like storage buckets and databases.
You can manage Kubernetes with infrastructure as code.
The idea of infrastructure as code in relation to Kubernetes is that you have the full power of a programming language to build with, not just yaml files. You can also tie into other functionality of cloud providers as long as your IAC provider supports it. So you could have your Kubernetes cluster connect to some serverless code, or to a managed database, all deployed from one codebase.
Having said all this I didn’t actually have a great experience using Pulumi and switched to plain K8s. It makes a ton of sense in theory though and I’ll probably try again.
