vcd_catalog_vapp_template: Add support for copy from other catalog

[jpbuecken]

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Description

Similar to the existing possibilities like ova upload or capture vapp a vapp template could be created by copy of another catalog.
The vcd_catalog_vapp_template could pick up this feature.
Maybe it could be implemented in terraform stile with refresh feature, not only as one shot:
(

• if a vapp template with the same name exists in source catalog and target catalog it is "no changes",
• if the vapp template is missing in the target catalog it is changes,
• if the source is missing it is error)

New or Affected Resource(s)

• vcd_catalog_vapp_template

Terraform Configuration (if it applies)

data "vcd_catalog" "cat" {
  org  = "v51"
  name = "cat-v51-nsxt-backed"
}
data "vcd_catalog" "cat2" {
  org  = "v51"
  name = "cat-v51-nsxt-backed2"
}

resource "vcd_catalog_vapp_template" "from-catalog" {
  org        = "v51"
  catalog_id = data.vcd_catalog.cat.id

  name = "source-vApp-name"
  source_catalog_id = data.vcd_catalog.cat2.id
}

If needed, a Screenshot of the catalog copy button of the VCD UI can be provided, to clarify the feature request.