feat: add health check and heartbeat endpoint to Docker setup

utils/PostHandler.py

@@ -24,6 +24,11 @@ class Handler(BaseHTTPRequestHandler):
             self.wfile.write(b'404 Not Found')
             
     def do_GET(self):
-        self.send_response(404)
-        self.end_headers()
-        self.wfile.write(b'404 Not Found')
+        if self.path == '/heartbeat':
+            self.send_response(200)
+            self.end_headers()
+            self.wfile.write(b'Heartbeat OK')
+        else:
+            self.send_response(404)
+            self.end_headers()
+            self.wfile.write(b'404 Not Found')