refactor: simply global mergeconfig

lib/workers/global/index.js

@@ -33,8 +33,8 @@ async function start() {
       delete config[key];
     });
     // Iterate through repositories sequentially
-    for (let index = 0; index < config.repositories.length; index += 1) {
-      const repoConfig = module.exports.getRepositoryConfig(config, index);
+    for (const repository of config.repositories) {
+      const repoConfig = getRepositoryConfig(config, repository);
       await repositoryWorker.renovateRepository(repoConfig, repoConfig.token);
     }
     logger.setMeta({});
@@ -45,12 +45,11 @@ async function start() {
   }
 }
 
-function getRepositoryConfig(globalConfig, index) {
-  let repository = globalConfig.repositories[index];
-  if (typeof repository === 'string') {
-    repository = { repository };
-  }
-  const repoConfig = configParser.mergeChildConfig(globalConfig, repository);
+function getRepositoryConfig(globalConfig, repository) {
+  const repoConfig = configParser.mergeChildConfig(
+    globalConfig,
+    typeof repository === 'string' ? { repository } : repository
+  );
   repoConfig.isGitHub = repoConfig.platform === 'github';
   repoConfig.isGitLab = repoConfig.platform === 'gitlab';
   repoConfig.isVsts = repoConfig.platform === 'vsts';