fix: update local mode schema (#4185)

Author: trungleduc

src/sagemaker/config/config_schema.py

@@ -106,6 +106,7 @@
 LOCAL_CODE = "local_code"
 SERVING_PORT = "serving_port"
 CONTAINER_CONFIG = "container_config"
+CONTAINER_ROOT = "container_root"
 REGION_NAME = "region_name"
 
 
@@ -1090,6 +1091,9 @@ def _simple_path(*args: str):
                 SERVING_PORT: {
                     TYPE: "integer",
                 },
+                CONTAINER_ROOT: {
+                    TYPE: "string",
+                },
                 CONTAINER_CONFIG: {
                     TYPE: OBJECT,
                 },