feat: complete ni-mail rewrite with Graph API, IMAP, OTP extractor, Web UI and Docker deployment

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends     ca-certificates tini wget     && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app/ ./app/
+COPY scripts/entrypoint.sh ./entrypoint.sh
+RUN chmod +x ./entrypoint.sh
+
+RUN groupadd -r nimail && useradd -r -g nimail -d /app/data nimail     && mkdir -p /app/data     && chown nimail:nimail /app/data
+
+USER nimail
+
+EXPOSE 8080
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3   CMD wget -q -O /dev/null "http://127.0.0.1:8080/health" || exit 1
+
+ENV FLASK_APP=app:create_app()
+ENV DATA_DIR=/app/data
+ENV PORT=8080
+
+STOPSIGNAL SIGTERM
+ENTRYPOINT ["/usr/bin/tini", "--"]
+CMD ["./entrypoint.sh"]