rag-playground PermissionError: [Errno 13] Permission denied: '/app/frontend/__init__.py' #284

Using docker compose build in the ~/GenerativeAIExamples/RAG/examples/basic_rag/langchain directory, what appears to be the web front-end refuses to start:

Traceback (most recent call last):
File "/usr/lib/python3.10/runpy.py", line 187, in _run_module_as_main
mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
File "/usr/lib/python3.10/runpy.py", line 146, in _get_module_details
return _get_module_details(pkg_main_name, error)
File "/usr/lib/python3.10/runpy.py", line 110, in _get_module_details
import(pkg_name)
File "", line 1027, in _find_and_load
File "", line 1006, in _find_and_load_unlocked
File "", line 688, in _load_unlocked
File "", line 879, in exec_module
File "", line 1016, in get_code
File "", line 1073, in get_data
PermissionError: [Errno 13] Permission denied: '/app/frontend/init.py'