Initial commit: kantine2ical CLI, Flask-Server, Docker

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY kantine2ical.py app.py ./
+
+RUN useradd -m appuser
+USER appuser
+
+EXPOSE 8000
+
+CMD ["gunicorn", "-w", "1", "-b", "0.0.0.0:8000", "app:app"]