User admit doesn't get added

Trying to add an admin user in order to activate http authentication.

However the admin user doesn't seem to get added.

Here's my docker compose file:

```
influx-client-web:    
image: influxdb:latest    
restart: always    
environment:      
INFLUXDB_DB: 'metrics'      
INFLUXDB_HTTP_AUTH_ENABLED: 'true'
INFLUXDB_ADMIN_USER: '***'      
INFLUXDB_ADMIN_PASSWORD: '***'
INFLUXDB_HTTP_LOG_ENABLED: 'false'
INFLUXDB_DATA_QUERY_LOG_ENABLED: 'false'    
volumes:        
- influx-web-data:/var/lib/influxdb    
ports:      
- '8086:8086'
```

Start with the Docker Compose configuration in the issue, especially the INFLUXDB_ADMIN_USER, INFLUXDB_ADMIN_PASSWORD, INFLUXDB_HTTP_AUTH_ENABLED, and persistent volume settings. Reproduce the container startup with the shown environment and verify whether the admin user is created and HTTP authentication works; done means the configured user can authenticate.

Written by the indexing model from the issue text.