[compliance] User-defined regional constraint on workspace-cluster selection

Is your feature request related to a problem? Please describe

We have a limitation due to contractual/regulation limitations that require source code to always stay within the United States. As such, we need an ability to ensure that the environment we are deployed to at any time is only within the United States.

Describe the behaviour you'd like

Ideally, on a per-repository basis, we could select which data center we want to utilize, this would then limit the deployment to that data center.

Describe alternatives you've considered

For us, without this ability we will not be able to use the product at all, there is no workaround available.

Additional context

This is a requirement for many individuals developing solutions for government clients, or those that have things such as Export Compliance to worry about with encryption technology.

Start by tracing how repositories select workspaces and clusters, then identify where deployment location can be constrained. Done means a per-repository choice limits environments to the selected data center or region, including a United States-only option for compliance requirements.