Use Poetry, update base Python image

Dockerfile

-FROM python:3.9-slim-bullseye AS base
+FROM python:3.10-slim-bullseye AS base
 
+ENV PYTHONDONTWRITEBYTECODE 1
 ENV PYTHONUNBUFFERED=1
 
 WORKDIR /steering
-COPY requirements.txt .
+COPY poetry.lock pyproject.toml ./
 
 RUN apt-get update && apt-get install -y libmagic1 curl graphviz
 
-RUN pip install --upgrade pip setuptools
-RUN pip install --no-cache-dir -r requirements.txt
+RUN pip install poetry==1.2.1
+RUN poetry install
 
 EXPOSE 8000
 
@@ -16,10 +17,10 @@ EXPOSE 8000
 FROM base AS dev
 
 VOLUME ["/steering"]
-CMD ["python", "manage.py", "runserver", "0.0.0.0:8000" ]
+CMD ["poetry", "run", "python", "manage.py", "runserver", "0.0.0.0:8000"]
 
 
 FROM base AS prod
 
 COPY . .
-CMD ["sh", "-c", "gunicorn -b 0.0.0.0:8000 -w $(nproc) steering.wsgi"]
+CMD ["poetry", "run", "gunicorn", "-b", "0.0.0.0:8000", "-w", "$(nproc)", "steering.wsgi"]