we can't activate venv, we are doing what source activate will do

python-docker.yml

#FROM python:3.9-slim-bullseye

ENV VIRTUAL_ENV=/opt/venv
RUN python3 -m venv $VIRTUAL_ENV
ENV PATH="$VIRTUAL_ENV/bin:$PATH"

# Install dependencies:
#COPY requirements.txt .
#RUN pip install -r requirements.txt

# Run the application:
#COPY myapp.py .
#CMD ["python", "myapp.py"]