Add Promtail Nomad Pack

[RickyGrassmuck]

This PR adds a Nomad Pack for the Promtail application.

[mikenomitch]

Hey @rigrassm, thanks for the contribution, and congrats on being the first community pack PR!

On first glance this looks great. We'll take a shot at configuring and deploying this to a test cluster early next week and assuming all is well, we can get this merged shortly.

Thanks again!

[RickyGrassmuck]

Sounds good!

I've got a whole bunch of jobs I've created over the last year that will definitely benefit from being "packed".

I'll probably be submitting a pack for the Openstack Cinder CSI driver on Monday.

Really hoping to see some traction on this open feature request for Nomad now as it would make deploying common stateful container workloads incredibly simple!

[hashicorp-cla]

All committers have signed the CLA.

[mikenomitch]

This looks great to me. One minor tweak necessary to get the syntax working properly, but other than that it LGTM.

EDIT: also the http_port might not be getting thread thru properly

[jrasell]

Looking really good and thanks so much for this!

Along with some inline comments I would love if we could format the variables file so it confirms to HCL formatting.

A non-blocking comment would be that we have a number of top level promtail configuration options as their own variable; I wonder if this would be better suited and easier to understand if we had a single object which detailed these?

[jrasell]

Looking great, a couple final comments and suggestions and then I think we are good to merge. Thanks so much!

[jrasell]

Thanks so much @rigrassm!

[RickyGrassmuck]

@jrasell Just came across this blog post, , did this PR qualify me for the first community provided pack contribution backpack??