DX: PR friendly, branch-specific PHP CS Fixer cache files

Author: keradus

.php-cs-fixer.dist.php

@@ -342,6 +342,6 @@
         'whitespace_after_comma_in_array' => true,
     ]);
 
-$config->setCacheFile(__DIR__ . '/.php-cs-fixer.cache/' . sha1(@trim((string) @shell_exec('git rev-parse --abbrev-ref HEAD'))));
+$config->setCacheFile(__DIR__ . '/.php-cs-fixer.cache/' . json_decode((string) @file_get_contents('composer.json'), true)["extra"]["branch-alias"]["dev-master"] ?? 'unknown');
 
 return $config;