Expose multiple ports per virtual host

[rolsonquadras]

The current jwilder/nginx-proxy image doesn't allow to expose multiple ports per virtual hosts. The DIDComm related images like router, adapters expose multiple ports. We need to find a solution to expose multiple ports.

Ref - https://github.com/nginx-proxy/nginx-proxy/pull/1157

[spatarel]

This feature is mandatory, since there are many off-the-shelf official docker images that expose more than a single HTTP port.