Add dependency on kv_secrets_cabe role assignment

Author: tjsullivan1

infra/terraform/_aca-be.tf

@@ -153,4 +153,8 @@ resource "azurerm_container_app" "backend" {
   lifecycle {
     # ignore_changes = []
   }
-}
+
+  depends_on = [
+    azurerm_role_assignment.kv_secrets_cabe
+  ]
+}