1.5.6

• Fix php-fpm on linux in PHP 5.6 and 7.0.
• Shift to rotating stable tags
• Bump to 7.4.0 stable version
• Fix phpdbg version and install it on PHP 7.4.
• Update Update-PhpCAInfo command in win32.ps1
• Switch to Homebrew for PHP 7.4
• Add 7.4 version to README and workflow.
• Improve checks in workflow.
• Show semantic versions on PHP install and correct logs.