Add Integtomat implementation of PostPusher

Add an Integromat post pusher and add it to the queue worker so that
posts are pushed both to IFTTT (for Twitter) and Integromat (for
LinkedIn).

References #340

web/modules/custom/blog/src/Plugin/QueueWorker/PostPusherQueueWorker.php

@@ -9,6 +9,7 @@ use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\Core\Queue\QueueWorkerBase;
 use Drupal\opdavies_blog\Entity\Node\Post;
 use Drupal\opdavies_blog\Service\PostPusher\IftttPostPusher;
+use Drupal\opdavies_blog\Service\PostPusher\IntegromatPostPusher;
 use Drupal\opdavies_blog\Service\PostPusher\PostPusher;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -54,6 +55,7 @@ final class PostPusherQueueWorker extends QueueWorkerBase implements ContainerFa
       $container->get('entity_type.manager')->getStorage('node'),
       [
         $container->get(IftttPostPusher::class),
+        $container->get(IntegromatPostPusher::class),
       ]
     );
   }

web/modules/custom/blog/src/Service/PostPusher/IntegromatPostPusher.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\opdavies_blog\Service\PostPusher;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\opdavies_blog\Entity\Node\Post;
+use GuzzleHttp\ClientInterface;
+use Webmozart\Assert\Assert;
+
+final class IntegromatPostPusher extends HttpPostPusher {
+
+  use StringTranslationTrait;
+
+  private ConfigFactoryInterface $configFactory;
+
+  public function __construct(
+    ClientInterface $client,
+    ConfigFactoryInterface $configFactory
+  ) {
+    $this->configFactory = $configFactory;
+
+    parent::__construct($client);
+  }
+
+  public function push(Post $post): void {
+    $url = $this->configFactory
+      ->get('opdavies_blog.settings')
+      ->get('integromat_webhook_url');
+
+    Assert::notNull($url, 'Cannot push the post if there is no URL.');
+
+    $this->client->post($url, [
+      'form_params' => [
+        'text' => $this->t('@text', ['@text' => $post->toTweet()])
+          ->render(),
+      ],
+    ]);
+  }
+
+}