fix: Fix zone auto-detection when var.zones are not set (#534)

Co-authored-by: Imran Nayer <[email protected]>

Author: legal90

modules/mysql/read_replica.tf

@@ -23,7 +23,7 @@ locals {
 }
 
 data "google_compute_zones" "available" {
-  count   = var.zone == null ? 0 : 1
+  count   = var.zone == null ? 1 : 0
   project = var.project_id
   region  = var.region
 }

modules/postgresql/read_replica.tf

@@ -23,7 +23,7 @@ locals {
 }
 
 data "google_compute_zones" "available" {
-  count   = var.zone == null ? 0 : 1
+  count   = var.zone == null ? 1 : 0
   project = var.project_id
   region  = var.region
 }