feat: support self_link_unique output of instance template resource (#347)

Co-authored-by: Awais Malik <[email protected]>

Author: tpdownes

modules/instance_template/README.md

@@ -62,6 +62,7 @@ See the [simple](../../examples/instance_template/simple) for a usage example.
 |------|-------------|
 | name | Name of instance template |
 | self\_link | Self-link of instance template |
+| self\_link\_unique | Unique self-link of instance template (recommended output to use instead of self\_link) |
 | tags | Tags that will be associated with instance(s) |
 
 <!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->

modules/instance_template/outputs.tf

@@ -14,6 +14,11 @@
  * limitations under the License.
  */
 
+output "self_link_unique" {
+  description = "Unique self-link of instance template (recommended output to use instead of self_link)"
+  value       = google_compute_instance_template.tpl.self_link_unique
+}
+
 output "self_link" {
   description = "Self-link of instance template"
   value       = google_compute_instance_template.tpl.self_link