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Dockerfile
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FROM --platform=$BUILDPLATFORM python:3.10 AS deps
# Install Poetry
RUN curl -sSL https://install.python-poetry.org | python3 - && /root/.local/bin/poetry config virtualenvs.create false
# Copy Poetry data
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY pyproject.toml poetry.lock ./
# Generate requirements list
RUN /root/.local/bin/poetry export -o requirements.txt
FROM python:3.10
# Install requirements
COPY --from=deps /usr/src/app/requirements.txt /requirements.txt
RUN pip --disable-pip-version-check install --no-cache-dir -r /requirements.txt
# Set up app
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY smtprelay.py ./
# Set up user
RUN mkdir -p /usr/src/app/home && \
useradd -d /usr/src/app/home -s /usr/sbin/nologin -u 998 appuser && \
chown appuser /usr/src/app/home
ENV PYTHONFAULTHANDLER=1
USER 998
EXPOSE 2525
CMD ["python3", "smtprelay.py"]