Swoole: Follow symlinks to enable zero-downtime deployment

[mikkpokk]

Issue is addressed in #1004. This PR fixes the addressed issue.

What does this PR do?

• If PHP SCRIPT_NAME contains the base directory and it differs from basePath, it replaces realpath paths with symlinked paths.
• Detects if the server is inside a symlinked directory and replaces realpaths with symlinked paths.
• Forwards the correct directory path to swoole-server using the environment parameter APP_RELEASE_BIN_DIR.
• swoole-server uses APP_RELEASE_BIN_DIR instead of the PHP realpath __DIR__.
• swoole-server listens to the Swoole event beforereload. Whenever the app is reloaded, it clears the PHP directory caches using clearstatcache(true).

[taylorotwell]

Hello! Are you able to update this PR to follow Laravel's code style conventions?

[mikkpokk]

@taylorotwell Hello! Done. Added the necessary PHPDoc and verified the code with Laravel Pint using vendor/bin/pint.

I've no idea why the Roadrunner tests on the cloud are failing randomly. They are not related at all. Most likely caused by #1008

[sy-records]

I've no idea why the Roadrunner tests on the cloud are failing randomly. They are not related at all. Most likely caused by #1008

Yep, I fixed it. #1023

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!