Support source_snapshot for instance template disks.

[rayward]

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Description

Per - https://cloud.google.com/compute/docs/reference/rest/v1/instanceTemplates - instance templates support creating disks from a snapshot: initializeParams.sourceSnapshot.

This is a supported method of creating an additional PD that isn't a boot disk.

New or Affected Resource(s)

• google_compute_instance_template

Potential Terraform Configuration

resource "google_compute_instance_template" "default" {
  name        = "appserver-template"

  disk {
    source_snapshot = "my-snapshot-name"
  }
}

References

• https://cloud.google.com/compute/docs/reference/rest/v1/instanceTemplates