HOLI-10718: add test stub to make pytest return 0

.gitignore

 build/
 **/.terraform.lock.hcl
 **/.terraform/
+**/__pycache__/

src/test_main.py

+from src.main import process_message
+
+def test_process_message():
+    process_message({'data': {}}, {})
\ No newline at end of file