Remove terraform.tfvars from example (#150)

* Remove terraform.tfvars, use variables.tf for defaults

* Run pre-commit

---------

Co-authored-by: gjohnson <[email protected]>
Co-authored-by: Rodrigue Koffi <[email protected]>

Author: gjohnson

examples/existing-cluster-with-base-and-infra/README.md

@@ -43,7 +43,8 @@ To run this example, you need to provide your EKS cluster name.
 If you don't have a cluster ready, visit [this example](../eks-cluster-with-vpc)
 first to create a new one.
 
-Add your cluster name for `eks_cluster_id="..."` to the `terraform.tfvars` or use an environment variable `export TF_VAR_eks_cluster_id=xxx`.
+Add your cluster name for `eks_cluster_id="..."` to a new `terraform.tfvars` file
+or use an environment variable `export TF_VAR_eks_cluster_id=xxx`.
 
 4. Amazon Managed Grafana workspace
 
@@ -170,7 +171,7 @@ terraform destroy -var-file=terraform.tfvars
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
 | <a name="input_aws_region"></a> [aws\_region](#input\_aws\_region) | AWS Region | `string` | n/a | yes |
-| <a name="input_eks_cluster_id"></a> [eks\_cluster\_id](#input\_eks\_cluster\_id) | Name of the EKS cluster | `string` | n/a | yes |
+| <a name="input_eks_cluster_id"></a> [eks\_cluster\_id](#input\_eks\_cluster\_id) | Name of the EKS cluster | `string` | `"eks-cluster-with-vpc"` | no |
 | <a name="input_enable_dashboards"></a> [enable\_dashboards](#input\_enable\_dashboards) | Enables or disables curated dashboards | `bool` | `true` | no |
 | <a name="input_grafana_api_key"></a> [grafana\_api\_key](#input\_grafana\_api\_key) | API key for authorizing the Grafana provider to make changes to Amazon Managed Grafana | `string` | n/a | yes |
 | <a name="input_managed_grafana_workspace_id"></a> [managed\_grafana\_workspace\_id](#input\_managed\_grafana\_workspace\_id) | Amazon Managed Grafana Workspace ID | `string` | n/a | yes |

examples/existing-cluster-with-base-and-infra/terraform.tfvars

@@ -1,6 +1,7 @@
 variable "eks_cluster_id" {
   description = "Name of the EKS cluster"
   type        = string
+  default     = "eks-cluster-with-vpc"
 }
 
 variable "aws_region" {