The huggingface/lerobot-gpu base image uses `uv` with a venv at
/lerobot/.venv — `pip` is not on PATH, so `pip install` fails with
"pip: not found". Switch to `uv pip install` which installs into the
existing venv.
Also drop the @v1.0.0 tag pin from the robocasa git URL since the
upstream repo may not have that tag; use default branch instead.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>