code: public function process(ContainerBuilder $container)
      {
          $definition = $container->findDefinition(LoaderCollection::class);
          $services = $container->findTaggedServiceIds('ds_tenant.loader');
          $items = [];
  
          foreach ($services as $id => $tags) {
              foreach ($tags as $tag) {
                  $items[] = [
                      'id' => $id,
                      'priority' => array_key_exists('priority', $tag) ? $tag['priority'] : 0,
                      'alias' => array_key_exists('alias', $tag) ? $tag['alias'] : null
                  ];
              }
          }
  
          usort($items, function($a, $b) {
              return
                  $a['priority'] === $b['priority'] ? 0
                  : $a['priority'] < $b['priority'] ? -1
                  : 1;
          });
  
          foreach ($items as $item) {
              if (null !== $item['alias']) {
                  $definition->addMethodCall('set', [$item['alias'], new Reference($item['id'])]);
              } else {
                  $definition->addMethodCall('add', [new Reference($item['id'])]);
              }
          }
      }
docs: Add tagged tenant loader services to the loader collection
  
  @param \Symfony\Component\DependencyInjection\ContainerBuilder $container