Add DEVICE constant from LEROBOT_TESTS_DEVICE

tests/utils.py

@@ -1,8 +1,10 @@
+import os
 import hydra
 from hydra import compose, initialize
 
 CONFIG_PATH = "../lerobot/configs"
 
+DEVICE = os.environ.get('LEROBOT_TESTS_DEVICE', "cuda")
 
 def init_config(config_name="default", overrides=None):
     hydra.core.global_hydra.GlobalHydra.instance().clear()