Initial React test app

Dockerfile

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+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+RUN npm run build
+
+# Production stage
+FROM node:20-alpine
+
+WORKDIR /app
+
+RUN npm install -g serve
+
+COPY --from=builder /app/dist ./dist
+
+EXPOSE 3000
+
+CMD ["serve", "-s", "dist", "-l", "3000"]