Implement Galaxy runner for Nomad

[innovate-invent]

https://pypi.org/project/python-nomad/
https://github.com/hashicorp/levant - relevant but not directly useable

The runner should take a HCL template and populate it with the job specifics. This way the template can be swapped out with the deployment and every possible parameter for running a job on Nomad doesn't need to be forwarded via the Galaxy config.

[innovate-invent]

The k8s and docker runners need to be rewritten to accept templates as well.
For k8s, it should take a k8s YAML file, and for docker it should take a docker compose YAML file.
For k8s, pykube needs to be replaced with https://github.com/kubernetes-client/python
For docker, compose functionality can be directly imported from https://github.com/docker/compose

All YAML files should be passed through a templating engine first. Because YAML uses # as comments, it would be ideal to use Galaxies existing Cheetah template engine as Cheetah uses # to demark template directives.