Allow setting tcp port other than 8080

[dlonghi]

Feature Request

Is it possible to set the tcp port to another value than 8080 (for those who use docker run --net=host option) ?

If not, could you please add this option ?

Note: Tried passing --env PORT=9090 to docker run, but still got 8080 as listen port.

Thanks

[coolerUA]

@dlonghi docker run -d -p 9090:8080 --name .....