refactor: log manual packageFiles config

lib/manager/index.js

@@ -166,6 +166,12 @@ function getManager(filename) {
 async function resolvePackageFiles(config) {
   logger.debug('manager.resolvePackageFile()');
   logger.trace({ config });
+  if (config.packageFiles && config.packageFiles.length) {
+    logger.info(
+      { packageFiles: config.packageFiles },
+      'Found configured packageFiles list'
+    );
+  }
   const allPackageFiles =
     config.packageFiles && config.packageFiles.length
       ? config.packageFiles