DI container cannot be built without valid JWT key

[alex-dev]

lcobucci/jwt@^4|^5 validate keys. Building DI container should be doable without any env var setup.

mercure:
  hubs:
    default:
      url: '%env(MERCURE_URL)%'
      public_url: '%env(MERCURE_PUBLIC_URL)%'
      jwt:
        secret: '%env(MERCURE_JWT_KEY)%'
        publish: ["*"]
        subscribe: ["*"]

Run php bin/console cache:warmup without providing MERCURE_JWT_KEY

[ostrolucky]

Created #99

Workaround until then:

<?php

declare(strict_types=1);

namespace App;

use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;
use Symfony\Component\Mercure\HubRegistry;

class Kernel extends BaseKernel
{
    use MicroKernelTrait;

    protected function build(ContainerBuilder $container): void
    {
        $container->addCompilerPass(new class implements CompilerPassInterface {
            public function process(ContainerBuilder $container)
            {
                // cache:warmup fails without this because it needs credentials already at compile time, which is where
                // we don't have that available yet, because we do it during docker build that doesn't have env vars yet
                // see https://github.com/symfony/mercure-bundle/issues/95
                $container->getDefinition(HubRegistry::class)->setLazy(true);
            }
        });
    }
}