OS layer image UTF-8 issue

$ docker run -v /tmp/akraino/validation/tests/variables.yaml:/opt/akraino/validation/tests/variables.yaml -v /tmp/akraino/results:/opt/akraino/results -v /home/ns156u/.ssh:/root/.ssh akraino/validation:os-latest /bin/sh -c 'cd /opt/akraino/validation && python bluval/bluval.py -l os rec'
Traceback (most recent call last):
File "bluval/bluval.py", line 148, in <module>
main()
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 764, in _call_
return self.main(*args, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 696, in main
_verify_python3_env()
File "/usr/local/lib/python3.6/dist-packages/click/_unicodefun.py", line 124, in _verify_python3_env
' mitigation steps.' + extra
RuntimeError: Click will abort further execution because Python 3 was configured to use ASCII as encoding for the environment. Consult https://click.palletsprojects.com/en/7.x/python3/ for mitigation steps.

This system supports the C.UTF-8 locale which is recommended.
You might be able to resolve your issue by exporting the
following environment variables:

export LC_ALL=C.UTF-8
export LANG=C.UTF-8