Using Certificates in Docker

Sometimes, for whatever reason, the docker application is required to use certificates to communicate. How to include certificates in your docker?

FROM python:3.7
WORKDIR /app
COPY app.py gunicorn-cfg.py requirements.txt ./
COPY ca.crt /usr/local/share/ca-certificates/ca-crt
RUN update-ca-certificates
RUN pip install -r requirements.txt
EXPOSE 5004
CMD ["gunicorn", "--config", "gunicorn-cfg.py", "app:app"]