Reload code inside docker container. PM2. Node js

I'm try to reload my node js app code inside docker container. I use pm2 as process manager. Here is my configurations: Dockerfile

FROM node:6.9.5

LABEL maintainer "denis.ostapenko2@gmail.com"

RUN mkdir -p /usr/src/koa2-app

COPY . /usr/src/koa2-app

WORKDIR /usr/src/koa2-app

RUN npm i -g pm2

RUN npm install

EXPOSE 9000

CMD [ "npm", "run", "production"]

ecosystem.prod.config.json (aka pm2 config)

{
  "apps" : [
    {
      "name"        : "koa2-fp",
      "script"      : "./bin/www.js",
      "watch"       : true,
      "merge_logs"  : true,
      "log_date_format": "YYYY-MM-DD HH:mm Z",
      "env": {
        "NODE_ENV": "production",
        "PROTOCOL": "http",
        "APP_PORT": 3000
      },
      "instances": 4,
      "exec_mode"  : "cluster_mode",
      "autorestart": true
    }
  ]
}

docker-compose.yaml

version: "3"
services:
  web:
    build: .
    volumes:
      - ./:/koa2-app
    ports:
      - "3000:3000"

npm run production - pm2 start --attach ecosystem.prod.config.json

I run 'docker-compose up' in the CLI and it works, I'm able to interact with my app on localhost:3000. But if make some change to code it will not show up in web. How can I configure code reloading inside docker?

P.S. And best practices question: Is it really OK to develop using docker stuff? Or docker containers is most preferable for production use.

via TK-95