fails out of box

```
$ docker-compose up
WARNING: The IMGPROXY_KEY variable is not set. Defaulting to a blank string.
WARNING: The IMGPROXY_SALT variable is not set. Defaulting to a blank string.
WARNING: The IMGPROXY_SIGNATURE variable is not set. Defaulting to a blank string.
ERROR: The Compose file './docker-compose.yml' is invalid because:
Unsupported config option for services.database: 'platform'
```