ephemeral resource: add google_secret_manager_secret_version support

[rd-michel]

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Description

We would like to use the new feature "ephemeral resources" to hide sensitive data/secrets in the terraform state

New or Affected Resource(s)

• google_secret_manager_secret_version

Potential Terraform Configuration

ephemeral "google_secret_manager_secret_version" "smtp-monitoring-password" {
  project = "gcp-test-project"
  secret  = "smtp-monitoring-password"
}

resource "kubernetes_secret" "smtp-monitoring" {
  metadata {
    name      = "smtp-monitoring"
    namespace = "monitoring"
  }

  data = {
    host     = "smtp.gmail.com"
    port     = 587
    username = "monitoring@testdomain.com"
    password = ephemeral.google_secret_manager_secret_version.smtp-monitoring-password.secret_data
  }
}

References

https://www.hashicorp.com/blog/terraform-1-10-improves-handling-secrets-in-state-with-ephemeral-values
https://developer.hashicorp.com/terraform/language/resources/ephemeral

[rileykarson]

Note: exempt from forwarding until we define the self-service contribution process

[Mu-Morsi]

Is it better if just using a toggle for ephemeral within the original datasource to apply the feature without having separate resource type ?

If so i can work on that within magic_modules!

data "google_secret_manager_secret_version" "token_secret" {
  secret         = "RELEASE_TOKEN"
  version       = "latest"
  ephemeral = true
}