add docker containerization

Dockerfile

@@ -0,0 +1,40 @@
+# Use Python 3.11 slim image
+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    FLASK_APP=app.py \
+    FLASK_ENV=production
+
+# Install system dependencies
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        gcc \
+        python3-dev \
+        curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first to leverage Docker cache
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the application
+COPY . .
+
+# Create volume for persistent database storage
+VOLUME ["/app/instance"]
+
+# Run as non-root user
+RUN useradd -m myuser
+RUN chown -R myuser:myuser /app
+USER myuser
+
+# Expose port
+EXPOSE 5000
+
+# Command to run the application
+CMD ["gunicorn", "-c", "gunicorn.conf.py", "app:app"]