allow setting stackit client target (#76)

Signed-off-by: Felix Breuer <f.breuer94@gmail.com>

Author: breuerfelix

pkg/provider/sdk_client.go

@@ -50,7 +50,8 @@ var (
 // - More secure than static tokens (short-lived, rotating)
 func createIAASClient(serviceAccountKey string) (*iaas.APIClient, error) {
 	// Configure SDK with custom base URL if provided (for testing with mock server)
-	baseURL := os.Getenv("STACKIT_API_ENDPOINT")
+	baseURL := os.Getenv("STACKIT_IAAS_ENDPOINT")
+	tokenEndpoint := os.Getenv("STACKIT_TOKEN_BASEURL")
 	noAuth := os.Getenv("STACKIT_NO_AUTH") == "true"
 
 	var opts []config.ConfigurationOption
@@ -72,6 +73,10 @@ func createIAASClient(serviceAccountKey string) (*iaas.APIClient, error) {
 		opts = append(opts, config.WithEndpoint(baseURL))
 	}
 
+	if tokenEndpoint != "" {
+		opts = append(opts, config.WithTokenEndpoint(tokenEndpoint))
+	}
+
 	iaasClient, err := iaas.NewAPIClient(opts...)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create STACKIT SDK API client: %w", err)