Dockerfile

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 && \
    /root/.local/bin/poetry self add poetry-plugin-export

# 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

ENV TINI_VERSION=v0.19.0
ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
RUN chmod +x /tini

# 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 k8s_emailer.py ./k8s_emailer.py
RUN printf -- '#!/bin/sh\npython3 -c "from k8s_emailer import main; main()" "$@"' > /usr/local/bin/k8s-emailer && \
    chmod +x /usr/local/bin/k8s-emailer

# 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
ENTRYPOINT ["/tini", "--"]
CMD ["k8s-emailer"]