Add secrets manager config in safer-cluster

[serbanmunteanu]

TL;DR

Hello,

Can we add in submodules safer-cluster the secrets-manager-config option as variable ?
Looks like it's missing

Terraform Resources

https://registry.terraform.io/modules/terraform-google-modules/kubernetes-engine/google/latest/submodules/safer-cluster?tab=inputs

Detailed design

Add in variables:

var "enable_secret_manager" {
  type = bool
  default = false
}

Additional information

No response