Include parent job ID as a Docker container label #17751

[devashishTaneja]

Fixes: #17751

[hashicorp-cla]

All committers have signed the CLA.

[tgross]

Looking pretty good @devashishTaneja! In addition to the comments I've left, can you run make cl to add a changelog entry?

---

I've smoke tested this with the following jobspec:

job "example" {
  type        = "batch"

  parameterized {
    payload = "required"
  }

  group "group" {
    task "task" {
      driver = "docker"
      config {
        image   = "busybox:1"
        command = "/bin/sh"
        args    = ["-c", "cat local/payload.txt; sleep 300"]
      }
      dispatch_payload {
        file = "payload.txt"
      }
    }
  }
}

After running and dispatching that job, I get the following labels on the resulting container:

$ docker inspect 120 | jq '.[0].Config.Labels'
{
  "com.hashicorp.nomad.alloc_id": "45b9fe13-0c85-9b87-0f3d-1c82774d9b5f",
  "com.hashicorp.nomad.job_id": "example/dispatch-1688760549-ec1a5470",
  "com.hashicorp.nomad.job_name": "example/dispatch-1688760549-ec1a5470",
  "com.hashicorp.nomad.parent_job_id": "example",
  "com.hashicorp.nomad.task_name": "task"
}

[devashishTaneja]

@tgross All the review comments are taken care. Please check

[devashishTaneja]

@tgross Please have a look when possible.

[tgross]

Looking good @devashishTaneja! Just a couple more items to wrap up.

[devashishTaneja]

@tgross taken care of changelog and proto suggestions

[tgross]

LGTM! Thanks @devashishTaneja !