Add Docker support with Dockerfile and .dockerignore

.dockerignore

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+node_modules
+dist
+Dockerfile
+.dockerignore
+.gitignore
+eslint.config.js
+README.md

Dockerfile

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+FROM node:23.7.0-alpine3.21 as builder
+
+WORKDIR /app
+
+COPY package*.json .
+RUN npm ci --omit=dev && npm cache clean --force
+
+COPY . .
+
+RUN npm run build
+
+FROM nginx:alpine
+
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+EXPOSE 3006
+
+CMD ["nginx", "-g", "daemon off;"]