Undefined constant "Modules\Admin\Controllers\GLOB_BRACE"

Describe the bug

On non GNU systems, the GLOB_BRACE flag used in castopod is not available as stated in the php manual:

Note: The GLOB_BRACE flag is not available on some non GNU systems, like Solaris or Alpine Linux.

Steps to reproduce

1. Run castopod on an Alpine system
2. Run housekeeping
3. Whoops! --> see logs for the corresponding error.

Expected behavior

Housekeeping should go through.

Relevant logs and/or screenshots

CRITICAL - 2022-01-29 10:14:50 --> Undefined constant "Modules\Admin\Controllers\GLOB_BRACE"
#0 /castopod/vendor/codeigniter4/codeigniter4/system/CodeIgniter.php(825): Modules\Admin\Controllers\SettingsController->runHousekeeping()
#1 /castopod/vendor/codeigniter4/codeigniter4/system/CodeIgniter.php(412): CodeIgniter\CodeIgniter->runController(Object(Modules\Admin\Controllers\SettingsController))
#2 /castopod/vendor/codeigniter4/codeigniter4/system/CodeIgniter.php(320): CodeIgniter\CodeIgniter->handleRequest(NULL, Object(Config\Cache), false)
#3 /castopod/public/index.php(41): CodeIgniter\CodeIgniter->run()
#4 {main}

Context

• Castopod: beta.3
• OS: Alpine
• Browser: any
• Web server: nginx

Possible fixes

Do not use GLOB_BRACE.