如何在Docker容器中设置Nodemon?

我正在尝试在Docker容器中设置Nodemon。它显示nodemon正在运行,但当我在index.js文件中更改代码时,它不会像在docker之外那样重新加载。我尝试将-L添加到命令中,但没有成功。我也尝试过在docker文件中安装nodemon,但是没有成功。

每当我更改我的index.js文件时,我都必须执行docker-compose up --build。

有什么想法吗?

下面是我的文件结构:

-api
  -node_modules
  -.dockerignore
  -Dockerfile
  -index.js
  -package.json
  -package-lock.json
-docker-compose.yml

docker-compose.yml:

version: '3.4'

services:
  api:
    build:
      context: ./api
    container_name: api
    environment:
      - PORT=3001
    volumes:
      - ./api/src:/usr/app/src
    ports:
      - '3001:3001'
    command: npm run dev

Dockerfile:

FROM node:14.15.2-alpine3.12

WORKDIR /usr/app

COPY package*.json ./

RUN npm install

COPY . .

package.json:

{
 "name": "api",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "dependencies": {
    "express": "^4.17.1"
  },
  "scripts": {
    "dev": "nodemon index.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "nodemon": "^2.0.6"
  }
}

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