feat: upgrade to node 15.0.1

# specify the node base image with your desired version node:<version>
FROM node:10
# replace this with your application's default port
EXPOSE 8888

$ docker build -t my-nodejs-app .
$ docker run -it --rm --name my-running-app my-nodejs-app

version: "2"
services:
  node:
    image: "node:8"
    user: "node"
    working_dir: /home/node/app
    environment:
      - NODE_ENV=production
    volumes:
      - ./:/home/node/app
    expose:
      - "8081"
    command: "npm start"

$ docker-compose up -d

$ docker run -it --rm --name my-running-script -v "$PWD":/usr/src/app -w /usr/src/app node:8 node your-daemon-or-script.js

FROM node
ENV NPM_CONFIG_LOGLEVEL info
...

$ docker run -e NPM_CONFIG_LOGLEVEL=info node ...

$ docker run node npm --loglevel=warn ...