Add offline mode in the configuration for wandb logging (#897)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Steven Palma <imstevenpmwork@ieee.org>

lerobot/common/utils/wandb_utils.py

@@ -90,6 +90,7 @@ class WandBLogger:
             # TODO(rcadene): split train and eval, and run async eval with job_type="eval"
             job_type="train_eval",
             resume="must" if cfg.resume else None,
+            mode=self.cfg.mode if self.cfg.mode in ["online", "offline", "disabled"] else "online",
         )
         print(colored("Logs will be synced with wandb.", "blue", attrs=["bold"]))
         logging.info(f"Track this run --> {colored(wandb.run.get_url(), 'yellow', attrs=['bold'])}")