Feature: Support STACKIT IDP on `stackit_ske_cluster`

[JanStern]

Problem description

The Portal exposes an Authentication option for SKE clusters to connect them to the STACKIT IdP ("STACKIT IDP: On"), but stackit_ske_cluster has no attribute to manage it. This forces a manual Portal/CLI step and causes drift.

Proposed solution

Add an option to toggle STACKIT IdP declaratively.
It is already part of the stackit-sdk-go and only needs to be surfaced.

Something like:

resource "stackit_ske_cluster" "example" {
  # ...
  authentication = {
    stackit_idp = true
  }
}

Alternative solutions (optional)

Additional information

[Manuelvaas]

Hi @JanStern,
thank you for your request; we're already planning to integrate it. Unfortunately, we are currently blocked on that topic, but we're actively working on a solution, and it should be available within the next few weeks.