Add dockerfile

.dockerignore

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+node_modules
+.git
+*.log

Dockerfile

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+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --only=production
+
+COPY index.js ./
+
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/index.js .
+
+RUN addgroup -g 1001 -S nodejs && \
+    adduser -S nodejs -u 1001
+
+USER nodejs
+
+EXPOSE 3000
+
+CMD ["node", "index.js"]