New CLI command to create the initial API key idempotently

module/CLI/config/cli.config.php

@@ -24,6 +24,7 @@ return [
             Command\Api\GenerateKeyCommand::NAME => Command\Api\GenerateKeyCommand::class,
             Command\Api\DisableKeyCommand::NAME => Command\Api\DisableKeyCommand::class,
             Command\Api\ListKeysCommand::NAME => Command\Api\ListKeysCommand::class,
+            Command\Api\InitialApiKeyCommand::NAME => Command\Api\InitialApiKeyCommand::class,
 
             Command\Tag\ListTagsCommand::NAME => Command\Tag\ListTagsCommand::class,
             Command\Tag\RenameTagCommand::NAME => Command\Tag\RenameTagCommand::class,

module/CLI/config/dependencies.config.php

@@ -53,6 +53,7 @@ return [
             Command\Api\GenerateKeyCommand::class => ConfigAbstractFactory::class,
             Command\Api\DisableKeyCommand::class => ConfigAbstractFactory::class,
             Command\Api\ListKeysCommand::class => ConfigAbstractFactory::class,
+            Command\Api\InitialApiKeyCommand::class => ConfigAbstractFactory::class,
 
             Command\Tag\ListTagsCommand::class => ConfigAbstractFactory::class,
             Command\Tag\RenameTagCommand::class => ConfigAbstractFactory::class,
@@ -105,6 +106,7 @@ return [
         Command\Api\GenerateKeyCommand::class => [ApiKeyService::class, ApiKey\RoleResolver::class],
         Command\Api\DisableKeyCommand::class => [ApiKeyService::class],
         Command\Api\ListKeysCommand::class => [ApiKeyService::class],
+        Command\Api\InitialApiKeyCommand::class => [ApiKeyService::class],
 
         Command\Tag\ListTagsCommand::class => [TagService::class],
         Command\Tag\RenameTagCommand::class => [TagService::class],

module/CLI/src/Command/Api/InitialApiKeyCommand.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\CLI\Command\Api;
+
+use Shlinkio\Shlink\CLI\Util\ExitCode;
+use Shlinkio\Shlink\Rest\Service\ApiKeyServiceInterface;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class InitialApiKeyCommand extends Command
+{
+    public const NAME = 'api-key:initial';
+
+    public function __construct(private readonly ApiKeyServiceInterface $apiKeyService)
+    {
+        parent::__construct();
+    }
+
+    protected function configure(): void
+    {
+        $this
+            ->setHidden()
+            ->setName(self::NAME)
+            ->setDescription('Tries to create initial API key')
+            ->addArgument('apiKey', InputArgument::REQUIRED, 'The initial API to create');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): ?int
+    {
+        $key = $input->getArgument('apiKey');
+        $result = $this->apiKeyService->createInitial($key);
+
+        if ($result === null && $output->isVerbose()) {
+            $output->writeln('<comment>Other API keys already exist. Initial API key creation skipped.</comment>');
+        }
+
+        return ExitCode::EXIT_SUCCESS;
+    }
+}