Fix CUDA: ctypes preload cuDNN + ldconfig + shutdown=14400

miner.py

@@ -3,11 +3,15 @@ import math
 import os
 import glob
 import site
+import ctypes
 
-# Ensure pip-installed NVIDIA CUDA/cuDNN libraries are discoverable
+# Preload pip-installed NVIDIA cuDNN so onnxruntime can use CUDAExecutionProvider
 for sp in site.getsitepackages():
     for d in glob.glob(os.path.join(sp, 'nvidia', '*', 'lib')):
         os.environ['LD_LIBRARY_PATH'] = d + ':' + os.environ.get('LD_LIBRARY_PATH', '')
+        _cudnn = os.path.join(d, 'libcudnn.so.9')
+        if os.path.exists(_cudnn):
+            ctypes.CDLL(_cudnn, mode=ctypes.RTLD_GLOBAL)
 
 import cv2
 import numpy as np