Dockerfile

FROM python:3.9-slim

RUN useradd -m -u 1000 user
USER user
ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH
WORKDIR $HOME/app

COPY --chown=user . $HOME/app
COPY ./requirements.txt $HOME/app/requirements.txt

USER root
RUN apt-get update && \
    apt-get install espeak && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

USER user
RUN pip install --no-cache-dir -r requirements.txt

CMD ["python", "app.py"]