"repositories": [
    {
      "type": "git",
      "url": "....git"
    }
]

use \Bitrix\Main\Data\cache;

$cache = cache::createInstance();

if( $cache->initCache( $ttl, $id, $id ) ){
	$res = $cache->getVars();
	$arRes = $res["arRes"];
}else{
	$res = array();
	try{
		$cache->startDataCache( $ttl, $id, $id );
		$cache->endDataCache( array(
			"arRes" => $arRes
		) );
	}catch( SystemException $e ){
		$cache->abortDataCache();
		ShowError( $e->getMessage() );
	}
}