Add Docker support with configuration files and environment setup

Dockerfile

@@ -0,0 +1,39 @@
+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci
+
+# Copy source code
+COPY . .
+
+# Build arguments for Supabase configuration
+ARG VITE_SUPABASE_URL
+ARG VITE_SUPABASE_ANON_KEY
+
+# Set environment variables for build
+ENV VITE_SUPABASE_URL=$VITE_SUPABASE_URL
+ENV VITE_SUPABASE_ANON_KEY=$VITE_SUPABASE_ANON_KEY
+
+# Build the application
+RUN npm run build
+
+# Production stage
+FROM nginx:alpine
+
+# Copy custom nginx config
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# Copy built assets from builder
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Expose port 80
+EXPOSE 80
+
+# Start nginx
+CMD ["nginx", "-g", "daemon off;"]