The `data.stackit_image...` data source should allow discovering image ids

[albgus]

Problem description

Creating a stackit_server resource requires specifying an image_id, it would be useful to be able to discover this in Terraform based on a human friendly label.

This would also be useful for images we upload ourselves, as we for instance for a workflow when we're provided an image with a specific version that we upload outside of the Terraform deployment, then we just switch the image version reference.

Proposed solution

I would like to be able to use Terraform to discover the image_id based on the image name, or the distribution family. Bonus points for being able to automatically select the latest minor release of the specified distribution. For the latter part I would suggest being able to labels to filter the request and select the latest published version (see data.aws_ami use of most_recent).

data "stackit_image" "ubuntu" {
  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

  name = "Ubuntu 24.04"
}

data "stackit_image" "alpine" {
  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

  labels = {
    os = "linux",
    distro = "alpine",
    version = "3.*"
  }
  most_recent = true  
}