Add Dockerfile

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application
+COPY . .
+
+# Create data directory
+RUN mkdir -p /app/data
+
+# Set environment variables
+ENV FLASK_APP=app.py
+ENV DATABASE_URL=sqlite:///data/timekeeper.db
+
+# Expose port
+EXPOSE 5000
+
+# Run with gunicorn
+CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--workers", "2", "app:app"]