Updating Dockerfile / docker portion of the tutorial

[HSBERG]

`FROM python:3.8

WORKDIR /app

COPY requirements.txt start_server.py ./
RUN pip3 install --upgrade pip
RUN pip3 install -r requirements.txt

COPY server/ server/
COPY migrations/ migrations/
COPY characters/ characters/

CMD python ./start_server.py`

was the only way I could get my server to start alongside libseccomp2 (2.5.1) (using Raspberry Pi). Having slightly more instruction would be beneficial for beginners. Could we please see an update to the docker portion?

[oldmud0]

Okay.