Add Dockerfile

Dockerfile

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+# Stage 1: Build stage
+FROM node:18-alpine AS builder
+
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+
+RUN npm ci --only=production=false
+
+COPY . .
+
+RUN npm run build
+
+# Stage 2: Production stage
+FROM nginx:alpine AS production
+
+COPY --from=builder /app/build /usr/share/nginx/html
+
+# Create a simple nginx configuration for SPA
+RUN echo 'server { \
+    listen 80; \
+    server_name localhost; \
+    root /usr/share/nginx/html; \
+    index index.html; \
+    location / { \
+        try_files $uri $uri/ /index.html; \
+    } \
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ { \
+        expires 1y; \
+        add_header Cache-Control "public, immutable"; \
+    } \
+}' > /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]