Start using Symfony Components

src/Container/CommandCompilerClass.php

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+<?php
+
+namespace Opdavies\GmailFilterBuilder\Container;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+class CommandCompilerClass implements CompilerPassInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container) {
+        $definition = $container->findDefinition('app.cli');
+        $taggedServices = $container->findTaggedServiceIds('ConsoleCommand');
+
+        foreach ($taggedServices as $id => $tags) {
+            $definition->addMethodCall('add', [new Reference($id)]);
+        }
+    }
+}

src/Container/Container.php

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+<?php
+
+namespace Opdavies\GmailFilterBuilder\Container;
+
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+
+class Container
+{
+    public function __construct()
+    {
+        $this->containerBuilder = new ContainerBuilder();
+        $loader = new YamlFileLoader($this->containerBuilder, new FileLocator(__DIR__.'/../../config'));
+        $loader->load('services.yml');
+        $this->containerBuilder->addCompilerPass(new CommandCompilerClass());
+        $this->containerBuilder->compile();
+    }
+
+    public function get($className)
+    {
+        return $this->containerBuilder->get($className);
+    }
+}