add docker for server demo

docker/nginx/Dockerfile

@@ -0,0 +1,32 @@
+FROM nginx:alpine
+
+# Install required packages
+RUN apk add --no-cache \
+    openssl \
+    certbot \
+    certbot-nginx \
+    bash
+
+# Create SSL directory
+RUN mkdir -p /etc/nginx/ssl
+
+# Copy SSL certificates (if they exist)
+COPY ssl/ /etc/nginx/ssl/
+
+# Copy Nginx configuration
+COPY conf.d/ /etc/nginx/conf.d/
+
+# Create log directories
+RUN mkdir -p /var/log/nginx
+
+# Copy SSL setup script
+COPY ssl-setup.sh /usr/local/bin/ssl-setup.sh
+RUN chmod +x /usr/local/bin/ssl-setup.sh
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+    CMD wget --quiet --tries=1 --spider http://localhost/health-check || exit 1
+
+EXPOSE 80 443
+
+CMD ["nginx", "-g", "daemon off;"]