fix: migration failed, directly exit the script (#36993)

Co-authored-by: Byron Wang <byron@dify.ai>

dev/start-api

@@ -5,7 +5,7 @@ set -x
 SCRIPT_DIR="$(dirname "$(realpath "$0")")"
 cd "$SCRIPT_DIR/../api" || exit 1
 
-uv run flask db upgrade
+uv run flask db upgrade || exit 1
 
 uv run \
   dotenv -f .env run --no-override -- python -m app