Add Docker deployment with SSL/Certbot support

Dockerfile

@@ -0,0 +1,18 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+
+RUN pip install --no-cache-dir -r requirements.txt
+RUN pip install gunicorn
+
+COPY . .
+
+ENV FLASK_APP=run.py
+ENV FLASK_ENV=production
+ENV PYTHONUNBUFFERED=1
+
+EXPOSE 8000
+
+CMD ["gunicorn", "--bind", "0.0.0.0:8000", "run:app", "--workers=2", "--access-logfile=-"]