Added commit_hash logging

Author: prishajain1

src/maxdiffusion/generate_wan.py

@@ -16,6 +16,7 @@
 import jax
 import time
 import os
+import subprocess
 from maxdiffusion.checkpointing.wan_checkpointer import WanCheckpointer2_1, WanCheckpointer2_2
 from maxdiffusion import pyconfig, max_logging, max_utils
 from absl import app