Add disk_attachment labels

[Enigo]

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Description

There is a way to build persistent disks, but no way to put labels on them

Use Case(s)

Labels help organize your resources

Potential configuration

  disk_attachment {
    volume_type = "pd-ssd"
    volume_size = 60
    keep_device = true
    labels      = {
      env     = "test"
      project = "packer"
    }
  }

Potential References

https://cloud.google.com/sdk/gcloud/reference/compute/disks/add-labels