[feature] Make env var NOMAD_HOST_PORT_xxx available for dynamic ports

[gpaggi]

The NOMAD_HOST_PORT_xxx environment variable is currently made available only for mapped ports and not for dynamic ones, where NOMAD_ADDR_xxx is made available (IP:PORT).

That would be handy, for instance, when using the java driver to start a service that takes the port number as a command line argument: -Dhttp.port=4569
At the moment I need to use the exec driver to run a script that splits NOMAD_ADDR_xxx and passes the port to my java application

[gpaggi]

Thanks for the quick followup @dadgar :)

[github-actions]

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