Added dockerization

Dockerfile

@@ -0,0 +1,20 @@
+ARG NODE_VERSION=24.6.0
+
+FROM node:${NODE_VERSION}-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN --mount=type=bind,source=package.json,target=package.json \
+    --mount=type=bind,source=package-lock.json,target=package-lock.json \
+    --mount=type=cache,target=/root/.npm \
+    npm ci
+COPY . .
+RUN npm prune --production
+
+FROM node:${NODE_VERSION}-alpine
+WORKDIR /app
+COPY --from=builder /app/node_modules node_modules/
+COPY --from=builder /app/index.js .
+USER node
+EXPOSE 12345
+ENV NODE_ENV=production
+CMD [ "node", "."]