Add a test runner and 2 very simple tests for agents

llama_stack/scripts/run_tests.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+THIS_DIR="$(cd "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")" && pwd)"
+
+set -euo pipefail
+set -x
+
+stack_dir=$(dirname $THIS_DIR)
+models_dir=$(dirname $(dirname $stack_dir))/llama-models
+PYTHONPATH=$models_dir:$stack_dir pytest -p no:warnings --asyncio-mode auto --tb=short