update Docker node version

Author: fengkx

Dockerfile

@@ -1,15 +1,15 @@
-FROM node:14.15.0-alpine as ts-builder
+FROM node:lts-alpine as ts-builder
 WORKDIR /app
 COPY . /app
 RUN npm install --ignore-scripts && npm run build
 
-FROM node:14.15.0-alpine as dep-builder
+FROM node:lts-alpine as dep-builder
 WORKDIR /app
 COPY package.json clean-nm.sh /app/
 RUN apk add --no-cache --update build-base python2
 RUN npm install --production && sh /app/clean-nm.sh
 
-FROM node:14.15.0-alpine as app
+FROM node:lts-alpine as app
 WORKDIR /app
 ENV NODE_PRODUTION true
 COPY data /app/data