Fix nightlies & untrack json files from git lfs (#414)

tests/data/lerobot/aloha_static_coffee/train/dataset_info.json

@@ -1,3 +1,64 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:55969ea876fc62b17afca0777816d93c1c90f23207a3562c907cfbd6502858f9
-size 1237
+{
+  "citation": "",
+  "description": "",
+  "features": {
+    "observation.images.cam_high": {
+      "_type": "VideoFrame"
+    },
+    "observation.images.cam_left_wrist": {
+      "_type": "VideoFrame"
+    },
+    "observation.images.cam_low": {
+      "_type": "VideoFrame"
+    },
+    "observation.images.cam_right_wrist": {
+      "_type": "VideoFrame"
+    },
+    "observation.state": {
+      "feature": {
+        "dtype": "float32",
+        "_type": "Value"
+      },
+      "length": 14,
+      "_type": "Sequence"
+    },
+    "observation.effort": {
+      "feature": {
+        "dtype": "float32",
+        "_type": "Value"
+      },
+      "length": 14,
+      "_type": "Sequence"
+    },
+    "action": {
+      "feature": {
+        "dtype": "float32",
+        "_type": "Value"
+      },
+      "length": 14,
+      "_type": "Sequence"
+    },
+    "episode_index": {
+      "dtype": "int64",
+      "_type": "Value"
+    },
+    "frame_index": {
+      "dtype": "int64",
+      "_type": "Value"
+    },
+    "timestamp": {
+      "dtype": "float32",
+      "_type": "Value"
+    },
+    "next.done": {
+      "dtype": "bool",
+      "_type": "Value"
+    },
+    "index": {
+      "dtype": "int64",
+      "_type": "Value"
+    }
+  },
+  "homepage": "",
+  "license": ""
+}

tests/data/lerobot/aloha_static_coffee/train/state.json

@@ -1,3 +1,13 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:35b4cf253f3b1342ae6cc151554b12e674e34631e1337e3ba8c0cadedda9ef34
-size 247
+{
+  "_data_files": [
+    {
+      "filename": "data-00000-of-00001.arrow"
+    }
+  ],
+  "_fingerprint": "422b8bf71785665b",
+  "_format_columns": null,
+  "_format_kwargs": {},
+  "_format_type": null,
+  "_output_all_columns": false,
+  "_split": null
+}