如何使用卷在dockerized DynamoDB中保留数据

Question

我的docker compose文件有两个容器，看起来像这样

  version: '3'

  services:
     dynamodb:
       image: amazon/dynamodb-local
       ports: 
         - '8000:8000'
       networks:
         - testnetwork

     audit-server:
         image: audit-dynamo
         environment:
         DYNAMO_URL: 'http://0.0.0.0:8000'
         command: node app.js
         ports: 
           - '3000:3000'
         depends_on: 
           - dynamodb
         # restart: always

         networks:
           - testnetwork

  networks:
    testnetwork:

我的目标是将本地数据安装到某个卷。目前正在丢失docker-compose down的数据