Added example atexit code

Author: Joel Collins

examples/builder.py

@@ -1,12 +1,18 @@
 import uuid
 import types
 import functools
+import atexit
+import logging
 
 from labthings.server.quick import create_app, property_of
 
 from components.pdf_component import PdfComponent
 
 
+def cleanup():
+    logging.info("Exiting. Running any cleanup code here...")
+
+
 # Create LabThings Flask app
 app, labthing = create_app(
     __name__,
@@ -34,6 +40,8 @@
     "/dictionary",
 )
 
+atexit.register(cleanup)
+
 # Start the app
 if __name__ == "__main__":
     from labthings.server.wsgi import Server