The generic Dockerfile.benchmark was using a plain `uv pip install ".[libero_plus]"`
which silently fails to make `libero` importable due to an upstream LIBERO-plus
packaging bug. Port the dedicated clone + .pth workaround from
Dockerfile.eval-libero-plus so `docker build --build-arg BENCHMARK=libero_plus`
produces working containers.
Also fix eval worker using nonexistent `parser.parse()` — use `draccus.parse()`.
Made-with: Cursor
Pepijn Kooijmans