[Bug]: Port allocation shared across sites

### Current URL

/sites/2/containers

### Username

rgingras

### Version

v2024.04.24-1 (4969f9e)

### Steps to reproduce

1. Add a new container in a new site
2. Observe higher port value than expected

### Expected behavior

Each site has it's own port namespace

### Actual behavior

Sites share port namespace

### Additional context

_No response_