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Or should I need seperate postgres db for keto and kratos

you can use the same db instance/cluster but should use separate databases

```version: "3.7"
services:
  db:
    container_name: "app_db"
    image: "postgres:11.5-alpine"
    volumes:
      - ./pg-init-scripts:/docker-entrypoint-initdb.d
    environment:
      - POSTGRES_USER=${DB_USER}
      - POSTGRES_PASSWORD=${DB_PASSWORD}
      - POSTGRES_MULTIPLE_DATABASES=app,app_test```

so i need something like this. single service , but multiple databases