Initializing mongo db in docker-compose with init script

mongo-docker-compose.yml

version: '3.8'

services:
  
  # Database - Mongo DB
  mongo:
    image: mongo
    environment:
      MONGO_INITDB_ROOT_USERNAME: helpdev
      MONGO_INITDB_ROOT_PASSWORD: 123456
    ports:
      - "27017:27017"
    volumes:
      - ./docker-entrypoint-initdb.d/mongo-init.js:/docker-entrypoint-initdb.d/mongo-init.js:ro

  # Database Manager
  mongo-express:
    image: mongo-express
    ports:
      - 8099:8081
    depends_on:
      - mongo
    environment:
      ME_CONFIG_BASICAUTH_USERNAME: express
      ME_CONFIG_BASICAUTH_PASSWORD: 123456
      ME_CONFIG_MONGODB_PORT: 27017
      ME_CONFIG_MONGODB_ADMINUSERNAME: helpdev
      ME_CONFIG_MONGODB_ADMINPASSWORD: 123456
    links:
      - mongo

mongo-init.js

db = db.getSiblingDB('sample_db');

db.createCollection('sample_collection');

db.sample_collection.insertMany([
 {
    org: 'helpdev',
    filter: 'EVENT_A',
    addrs: 'http://rest_client_1:8080/wh'
  },
  {
    org: 'helpdev',
    filter: 'EVENT_B',
    addrs: 'http://rest_client_2:8081/wh'
  },
  {
    org: 'github',
    filter: 'EVENT_C',
    addrs: 'http://rest_client_3:8082/wh'
  }  
]);