Speed up CI, add more checks (#115)

- Split pytest and end-to-end tests into separate jobs
- Add poetry check to ensure pyproject.toml and poetry.lock are in sync
- Add ruff format --diff to ensure style formatting is applied (fails if ruff would reformat anything)

lerobot/common/datasets/push_dataset_to_hub/pusht_processor.py

@@ -14,8 +14,8 @@ from lerobot.common.datasets.utils import (
 
 
 class PushTProcessor:
-    """ Process zarr files formatted like in: https://github.com/real-stanford/diffusion_policy
-    """
+    """Process zarr files formatted like in: https://github.com/real-stanford/diffusion_policy"""
+
     def __init__(self, folder_path: Path, fps: int | None = None):
         self.zarr_path = folder_path
         if fps is None: