feat(access-token): add ephemeral access-token resource (#1068)

* feat(access-token): add ephemeral access-token resource

Signed-off-by: Mauritz Uphoff <mauritz.uphoff@stackit.cloud>

examples/ephemeral-resources/stackit_access_token/ephemeral-resource.tf

@@ -0,0 +1,44 @@
+provider "stackit" {
+  default_region           = "eu01"
+  service_account_key_path = "/path/to/sa_key.json"
+  enable_beta_resources    = true
+}
+
+ephemeral "stackit_access_token" "example" {}
+
+locals {
+  stackit_api_base_url = "https://iaas.api.stackit.cloud"
+  public_ip_path       = "/v2/projects/${var.project_id}/regions/${var.region}/public-ips"
+
+  public_ip_payload = {
+    labels = {
+      key = "value"
+    }
+  }
+}
+
+# Docs: https://registry.terraform.io/providers/Mastercard/restapi/latest
+provider "restapi" {
+  uri                  = local.stackit_api_base_url
+  write_returns_object = true
+
+  headers = {
+    Authorization = "Bearer ${ephemeral.stackit_access_token.example.access_token}"
+    Content-Type  = "application/json"
+  }
+
+  create_method  = "POST"
+  update_method  = "PATCH"
+  destroy_method = "DELETE"
+}
+
+resource "restapi_object" "public_ip_restapi" {
+  path = local.public_ip_path
+  data = jsonencode(local.public_ip_payload)
+
+  id_attribute   = "id"
+  read_method    = "GET"
+  create_method  = "POST"
+  update_method  = "PATCH"
+  destroy_method = "DELETE"
+}