Add default value for k8s service account name in gke cluster

modules/scheduler/gke-cluster/README.md

@@ -161,7 +161,7 @@ limitations under the License.
 | <a name="input_enable_private_ipv6_google_access"></a> [enable\_private\_ipv6\_google\_access](#input\_enable\_private\_ipv6\_google\_access) | The private IPv6 google access type for the VMs in this subnet. | `bool` | `true` | no |
 | <a name="input_enable_private_nodes"></a> [enable\_private\_nodes](#input\_enable\_private\_nodes) | (Beta) Whether nodes have internal IP addresses only. | `bool` | `true` | no |
 | <a name="input_gcp_public_cidrs_access_enabled"></a> [gcp\_public\_cidrs\_access\_enabled](#input\_gcp\_public\_cidrs\_access\_enabled) | Whether the cluster master is accessible via all the Google Compute Engine Public IPs. To view this list of IP addresses look here https://cloud.google.com/compute/docs/faq#find_ip_range | `bool` | `false` | no |
-| <a name="input_k8s_service_account_name"></a> [k8s\_service\_account\_name](#input\_k8s\_service\_account\_name) | Kubernetes service account name to use with the gke cluster | `string` | `null` | no |
+| <a name="input_k8s_service_account_name"></a> [k8s\_service\_account\_name](#input\_k8s\_service\_account\_name) | Kubernetes service account name to use with the gke cluster | `string` | `"workload-identity-k8s-sa"` | no |
 | <a name="input_labels"></a> [labels](#input\_labels) | GCE resource labels to be applied to resources. Key-value pairs. | `map(string)` | n/a | yes |
 | <a name="input_maintenance_exclusions"></a> [maintenance\_exclusions](#input\_maintenance\_exclusions) | List of maintenance exclusions. A cluster can have up to three. | <pre>list(object({<br/>    name            = string<br/>    start_time      = string<br/>    end_time        = string<br/>    exclusion_scope = string<br/>  }))</pre> | `[]` | no |
 | <a name="input_maintenance_start_time"></a> [maintenance\_start\_time](#input\_maintenance\_start\_time) | Start time for daily maintenance operations. Specified in GMT with `HH:MM` format. | `string` | `"09:00"` | no |

modules/scheduler/gke-cluster/variables.tf

@@ -292,7 +292,7 @@ variable "configure_workload_identity_sa" {
 variable "k8s_service_account_name" {
   description = "Kubernetes service account name to use with the gke cluster"
   type        = string
-  default     = null
+  default     = "workload-identity-k8s-sa"
 }
 
 variable "autoscaling_profile" {