chore(tests): Use /dev/shm as a tempdirectory

Should fix tests in phpunit-32bits

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

tests/lib/TempManagerTest.php

@@ -44,7 +44,7 @@ class TempManagerTest extends \Test\TestCase {
 			$config = $this->createMock(IConfig::class);
 			$config->method('getSystemValue')
 				->with('tempdirectory', null)
-				->willReturn('/tmp');
+				->willReturn('/dev/shm');
 		}
 		$iniGetWrapper = $this->createMock(IniGetWrapper::class);
 		$manager = new TempManager($logger, $config, $iniGetWrapper);

tests/preseed-config.php

@@ -16,6 +16,7 @@ $CONFIG = [
 			'writable' => true,
 		],
 	],
+	'tempdirectory' => '/dev/shm',
 ];
 
 if (is_dir(OC::$SERVERROOT . '/apps2')) {