does prisma server have the concept of a workspace or is that something I would have to wrap around my services?

What do you mean with workspace?

I'm referring to the prisma cloud where each user gets a workspace and then can deploy their own services and stages: "This corresponds to the name of your workspace. For example, if your workspace is called john-doe, the endpoint might look as follows: http://prisma-eu1.sh/john-doe/my-service/dev"

Aha, No you need to build that yourself