MongoDB Compose file with environment variables

docker-compose.yml

version: '3.1'

services:
  db:
    container_name: Mongo-db
    image: mongo:latest
    restart: always
    volumes:
      - ./myData:/data/db
    environment:
      - MONGO_INITDB_DATABASE=MyDatabase
      - MONGODB_USER=Nya
      - MONGODB_PASS=secretpassword
    ports:
      - 27020:27017