Add Docker Compose deployment support

Dockerfile

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+FROM python:3.11-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+WORKDIR /app
+
+COPY requirements.txt /app/requirements.txt
+RUN pip install --no-cache-dir -r /app/requirements.txt
+
+COPY app.py /app/app.py
+COPY office365_admin /app/office365_admin
+COPY README.md /app/README.md
+
+RUN mkdir -p /app/logs
+
+EXPOSE 8000
+
+CMD ["gunicorn", "-w", "2", "-b", "0.0.0.0:8000", "app:app"]
+