Fix model deploy pr (#428)

* fix: Add --all flag to cdk deploy for multi-stack deployments

The model deployment template creates multiple CDK stacks (pipeline +
cross-region + endpoint stacks per environment). Without --all flag,
cdk deploy fails when multiple stacks exist.

This fix ensures the CodeBuild project can deploy all stacks in
cross-account/cross-region configurations.

* feat: Add region validation for cross-region deployment

---------

Co-authored-by: Nuri Boardman <nurboard@amazon.com>

Author: newman911

modules/sagemaker/sagemaker-templates/templates/model_deploy/product_stack.py

@@ -203,7 +203,7 @@ def __init__(
                                 "npm install -g aws-cdk",
                                 "python -m pip install -r requirements.txt",
                                 f"export REPOSITORY_TYPE={repository_type.value}",
-                                'cdk deploy --require-approval never --app "python app.py" ',
+                                'cdk deploy --all --require-approval never --app "python app.py" ',
                             ]
                         }
                     },

modules/sagemaker/sagemaker-templates/templates/model_deploy/seed_code/deploy_app/app.py

@@ -5,6 +5,18 @@
 from deploy_app.pipeline_stack import PipelineStack
 
 app = cdk.App()
+
+# All deployment regions must match - cross-region endpoint deployment is not supported
+# because model packages contain region-specific container image URIs
+regions = {
+    "dev": constants.DEV_REGION,
+    "pre-prod": constants.PRE_PROD_REGION,
+    "prod": constants.PROD_REGION,
+}
+mismatched = {k: v for k, v in regions.items() if v != constants.DEV_REGION}
+if mismatched:
+    raise ValueError(f"All deployment regions must match dev region ({constants.DEV_REGION}). Mismatched: {mismatched}")
+
 PipelineStack(
     app,
     f"{constants.PROJECT_NAME}-pipeline",