Add "listening address" and "port" flags to API

[cubuzz]

Proposed feature or solution

Please add flags that allow changing the listening address and port. When deploying on a production setup, it is not always possible to provide the hard-coded port, and it would simplify things drastically if they could be changed using either a flag or an environmental variable.

Alternatives

Alternatively introduce some sort of configuration file that would allow settings details like this.

Additional information

No response