add docker file for hugginface space

.dockerignore

@@ -0,0 +1,8 @@
+node_modules
+npm-debug.log
+.git
+.gitignore
+.env
+.env.*
+doc
+test

Dockerfile

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+FROM node:20-slim
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+COPY public ./public
+COPY src ./src
+
+ENV NODE_ENV=production
+ENV PORT=7860
+
+EXPOSE 7860
+
+CMD ["npm", "start"]