Delete servers on demand

// Decrease implements provider.InstanceGroup.

func (g *instanceGroup) Decrease(ctx context.Context, instances []string) (succeeded []string, err error) {

	return nil, nil

	errs := make([]error, 0)

	for _, id := range instances {

		if err := g.client.Servers.Delete(ctx, id); err != nil {

			errs = append(errs, fmt.Errorf("failed to delete server: %w", err))

			continue

		}

		succeeded = append(succeeded, id)

	}

	return succeeded, errors.Join(errs...)

}

// Update implements provider.InstanceGroup.