fix retain key

http-api/app/boto3clients.py

@@ -2,15 +2,16 @@ import os
 
 import boto3
 
-DYNAMODB_ENDPOINT_URL: str | None = None
 
-# Only when running `sam local start-api`
-if 'AWS_SAM_LOCAL' in os.environ:
-    DYNAMODB_ENDPOINT_URL = 'http://host.docker.internal:8000'
+def get_dynamodb_client():
+    sam_local = os.getenv('AWS_SAM_LOCAL')
 
-# Only when running `pytest`
-if 'PYTEST_VERSION' in os.environ:
-    DYNAMODB_ENDPOINT_URL = 'http://127.0.0.1:8000'
+    if os.getenv('AWS_LAMBDA_FUNCTION_NAME') and not sam_local:
+        return boto3.client('dynamodb')
 
-dynamodb_client = boto3.client('dynamodb', endpoint_url=DYNAMODB_ENDPOINT_URL)
+    url = 'host.docker.internal' if sam_local else 'localhost'
+    return boto3.client('dynamodb', endpoint_url=f'http://{url}:8000')
+
+
+dynamodb_client = get_dynamodb_client()
 idp_client = boto3.client('cognito-idp')