Support for Nomad's parameterized jobs and dispatch command

[simonsparks]

Nomad has recently introduced parameterized jobs which may be dispatched with a set of variables to customise a job instance.

It would be a great feature to provide an intuitive UI over Nomad's parameterized job dispatch, perhaps presenting a list of parameterized jobs to select from (and add to or modify) and a form or file upload option to populate the required fields for launching the selected job.

[jippi]

Yeah, it could be a really amazing feature to have in the UI

Need to figure out how to make this a smooth experience though :)