Docker build failed

[angarod]

The step 8 of Docker build (Step 8/14 : RUN python3 setup.py install) return :
python3: can't open file 'setup.py': [Errno 2] No such file or directory

[otgrkiss]

What I did:

`FROM debian:buster-slim
EXPOSE 9000

RUN apt-get update &&
apt-get -y install python3 python3-pip git build-essential default-libmysqlclient-dev

COPY . /MISP-Taxii-Server/
COPY config/config.default.yaml config/config.yaml

RUN pip3 install libtaxii==1.1.111 mysqlclient gunicorn opentaxii

WORKDIR /MISP-Taxii-Server
RUN python3 setup.py install

RUN export OPENTAXII_CONFIG=/MISP-Taxii-Server/config.yaml && export PYTHONPATH=.
RUN opentaxii-sync-data config/data-configuration.yaml

CMD ["gunicorn", "-b", "0.0.0.0:9000", "opentaxii.http:app"]`