ci(PHP 8.1): add CI processes for PHP 8.1

[erikn69]

Description

CI environment for the PHP 8.1 should be implemented. #3109

Motivation and Context

We need CI process(es) for automatic tests of the images for PHP 8.1

Types of Changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

Definition of Done Checklist:

• I've read the Contribution Guide.
• I've updated the documentation. (refer to this for how to do so).
• I enjoyed my time contributing and making developer's life easier :)

[erikn69]

Maybe the last tests(8.1, php-fpm/php-worker) will be fixed on next release of php-gnupg/php-gnupg#35 (comment)
php-gnupg/php-gnupg#41 (Fixed)

UPDATE: Only one problem on 8.1, php-worker, The command '/bin/sh -c pecl channel-update pecl.php.net; docker-php-ext-install mysqli mbstring pdo pdo_mysql tokenizer xml pcntl' returned a non-zero code: 2