`registry__create_container`

Create a container for artifacts.

Inputs: required container (workspace, project, or repo). Workspaces and projects require name; projects and repos require workspace_id. Repos also require source_type and source_uri. Optional fields depend on the selected container arm.
Returns: the created container and its handle.
Effect: writes state. Container names are stable handles and cannot be edited later.

Use registry__list_containers to find a parent workspace or project before creating a nested container.