dynamodb-local-docker-compose.yml

version: "3.8"

services:
  dynamodb-local:
    container_name: app-dynamodb-local
    command: "-jar DynamoDBLocal.jar -sharedDb -inMemory"
    image: amazon/dynamodb-local
    ports:
      - "8000:8000"
    # restart: unless-stopped

  dynamodb-admin:
    image: aaronshaf/dynamodb-admin
    ports:
      - "8001:8001"
    environment:
      - DYNAMO_ENDPOINT=http://host.docker.internal:8000
    depends_on:
      - dynamodb-local

  awscli-dynamodb-migrator:
    image: amazon/aws-cli
    command: |
      dynamodb create-table
      --table-name casbin-table-dev
      --attribute-definitions AttributeName=id,AttributeType=S
      --key-schema AttributeName=id,KeyType=HASH
      --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5
      --endpoint-url http://host.docker.internal:8000
    environment:
      - AWS_ACCESS_KEY_ID=unused
      - AWS_SECRET_ACCESS_KEY=unused
      - AWS_DEFAULT_REGION=us-east-1
    depends_on:
      - dynamodb-local
    # restart: unless-stopped

Changed the dynamodb instance to have a command that loses the data each run and shares all tables.
command: "-jar DynamoDBLocal.jar -sharedDb -inMemory"
In practice the -inMemory option can be removed to persist the data and the migrator fails safely.

Switched to using http://host.docker.internal:8000 to work around oddities of running docker inside wsl2.
Need to comfirm this works on a mac please 🙇