Add Support for the `source_image` field on `additional_disks`

[agosto-lorinronken]

TL;DR

Please add support for specifying the souce_image field when configuring additional_disks in your machine image template. This can be accomplished by adding the source_image field in the variables.tf file like so:

variable "additional_disks" {
  description = "List of maps of additional disks. See https://www.terraform.io/docs/providers/google/r/compute_instance_template.html#disk_name"
  type = list(object({
    disk_name    = string
    device_name  = string
    auto_delete  = bool
    boot         = bool
    disk_size_gb = number
    disk_type    = string
    disk_labels  = map(string)
    source_image = string
  }))
  default = []
}

Terraform Resources

No response

Detailed design

No response

Additional information

This should be a relatively simple change. I have found that there are occasions when we need to specify a source_image for specific additional disks that we are adding to our machine image template. Terraform supports this as seen in the documentation here.

[github-actions]

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