feat: add health check action (#3484)

actions/HealthAction.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+class HealthAction implements ActionInterface
+{
+    public function execute(array $request)
+    {
+        $response = [
+            'code' => 200,
+            'message' => 'all is good',
+        ];
+        return new Response(Json::encode($response), 200, ['content-type' => 'application/json']);
+    }
+}