Allow gpu.name as string in json schema (#3027)

Author: r4victor

src/dstack/_internal/core/models/resources.py

@@ -225,6 +225,10 @@ def schema_extra(schema: Dict[str, Any]):
                 schema["properties"]["count"],
                 extra_types=[{"type": "integer"}, {"type": "string"}],
             )
+            add_extra_schema_types(
+                schema["properties"]["name"],
+                extra_types=[{"type": "string"}],
+            )
             add_extra_schema_types(
                 schema["properties"]["memory"],
                 extra_types=[{"type": "integer"}, {"type": "string"}],