[Blueprints, 02-at-scale]: Use Secrets to pass terraform variables to Casc

[carlosrodlop]

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What is the outcome that you are trying to reach?

Reduce the complexity of adding terraform variables to Casc and use secrets to inject those values to Casc

https://github.com/cloudbees/terraform-aws-cloudbees-ci-eks-addon/tree/main/blueprints/02-at-scale#update-amazon-s3-bucket-settings

Describe the solution you would like

On the Terraform side

#124

resource "kubernetes_secret" "example" {
  metadata {
    name = "basic-auth"
  }

  data = {
    secS3bucketName = "${local.bucket_name}"
    secGrafanaUrlOT = "${local.grafanaURl}" 
  }

  type = "kubernetes.io/basic-auth"
}

On the Casc side

Replace variables by secrets ==> ${cbci_s3} by {sec_cbci_s3}

Describe alternatives you have considered

Additional context