at the end of the day, it was inevitable

src/CacheBundle/CacheBundle.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace CacheBundle;
+
+use CacheBundle\DependencyInjection\Compiler\CollectFeedFetchersCompilerPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\HttpKernel\Bundle\Bundle;
+
+/**
+ * Class CacheBundle
+ * @package CacheBundle
+ */
+class CacheBundle extends Bundle
+{
+
+    /**
+     * Builds the bundle.
+     *
+     * It is only ever called once when the cache is empty.
+     *
+     * @param ContainerBuilder $container A ContainerBuilder instance.
+     *
+     * @return void
+     */
+    public function build(ContainerBuilder $container)
+    {
+        $container->addCompilerPass(new CollectFeedFetchersCompilerPass());
+    }
+}