added docker setup

backend/Dockerfile

@@ -0,0 +1,32 @@
+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first for better caching
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Create non-root user
+RUN useradd --create-home --shell /bin/bash app && chown -R app:app /app
+USER app
+
+# Expose port
+EXPOSE 8000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
+    CMD python -c "import requests; requests.get('http://localhost:8000/orders')" || exit 1
+
+# Start the application
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]