[assets] fix docker image (#8180)

src/llamafactory/extras/env.py

@@ -15,6 +15,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import platform
 
 import accelerate
@@ -83,4 +84,9 @@ def print_env() -> None:
     except Exception:
         pass
 
+    if os.path.exists("data"):
+        info["Default data directory"] = "detected"
+    else:
+        info["Default data directory"] = "not detected"
+
     print("\n" + "\n".join([f"- {key}: {value}" for key, value in info.items()]) + "\n")