[feature request] Task dependencies for batch jobs

[dukeland9]

I think it's a common case that a batch job is divided into several steps, and each step depends on some previous steps.
Could we have something like:

job "batch_job" {
  type = "batch"
  group "g" {
    task "step1" {
    }
    task "step2" {
      depends_on = ["step1"]
    }
  }
}

Google borg supports such configuration.

[dadgar]

Hey @dukeland9,

Closing as a duplicate of #419

[github-actions]

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