TYPO3/surf snippets for TYPO3 CMS deployments

TYPO3-surf-deployment.php

<?php

// ...

/**
  * Set custom symlinks (in addition to fileadmin and uploads)
  */
$application->setSymlinks([
    'web/typo3conf/l10n' => '../../../../shared/Data/l10n'
]);

// ...

/**
  * Define task to generate the shared target folder "l10n"
  * and execute the task right after task "TYPO3\\Surf\\Task\\Generic\\CreateSymlinksTask"
  */
$workflow->defineTask('JosefGlatz\\TYPO3\\Distribution\\DefinedTask\\L10nShared', 'TYPO3\\Surf\\Task\\TYPO3\\CMS\\SymlinkDataTask', [
  'directories' => [
    'l10n'
  ],
]);
$workflow->afterTask('TYPO3\\Surf\\Task\\Generic\\CreateSymlinksTask', 'JosefGlatz\\TYPO3\\Distribution\\DefinedTask\\L10nShared', $application);

// ...

// If you want, you can add a language:update task for every deployment.
// You can run the language:update task also via scheduler on a regular basis if it takes to much time.

$workflow->defineTask('JosefGlatz\\TYPO3\\Distribution\\DefinedTask\\UpdateLanguages', RunCommandTask::class, [
  'command' => 'language:update',
]);
$workflow->afterTask('TYPO3\\Surf\\Task\\TYPO3\\CMS\\FlushCachesTask', 'JosefGlatz\\TYPO3\\Distribution\\DefinedTask\\UpdateLanguages', $application);

The SymlinkDataTask also creates the directory for you and symlinks it, you don't need $application->setSymlinks, but you have to use the full path:
So if you set $application->setOption(\TYPO3\Surf\Task\TYPO3\CMS\SymlinkDataTask::class . '[directories]', ['web/typo3conf/l10n']);
you get a folder shared/Data/web/typo3conf/l10n that is symlinked to web/typo3conf/l10n
See TYPO3/Surf#84