Fix issue with devspace package add

Author: FabianKramm

pkg/util/tar/tar.go

@@ -40,9 +40,9 @@ func ExtractSingleFileTarGz(archivepath, fileToExtract, extractToPath string) er
 
 		name := header.Name
 		if name == fileToExtract {
-			if header.Typeflag != tar.TypeReg {
-				return fmt.Errorf("%s is a directory and not a file", fileToExtract)
-			}
+			// if header.Typeflag != tar.TypeReg {
+			// 	return fmt.Errorf("%s is a directory and not a file", fileToExtract)
+			// }
 
 			outFile, err := os.Create(extractToPath)
 			if err != nil {