fix: container DB race condition, feat: separate images for app & worker, chore: example compose & .env files

src/Command/StartupStatusCommand.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Command;
+
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+#[AsCommand(
+    name: 'startup:status',
+    description: 'Add a short description for your command',
+)]
+class StartupStatusCommand extends Command
+{
+    private EntityManagerInterface $entityManager;
+
+    public function __construct(EntityManagerInterface $entityManager)
+    {
+        parent::__construct();
+        $this->entityManager = $entityManager;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $io = new SymfonyStyle($input, $output);
+
+        $ready = true;
+        $messengerTableExists = $this->doesMessengerTableExist();
+
+        if (false === $messengerTableExists) {
+            $ready = false;
+        }
+
+        return (true === $ready) ? Command::SUCCESS : Command::FAILURE;
+    }
+
+    private function doesMessengerTableExist()
+    {
+        return $this->entityManager->getConnection()
+            ->createSchemaManager()
+            ->tablesExist('messenger_messages');
+    }
+}