fix(permission): globalize and fixes

Permission alert frop OpenGrep is wrong, as the directory must use 0755.
To make things working and to ease futur changes, I set the default
permission in a constant.

generator/converter.go

@@ -173,9 +173,8 @@ func Convert(config ConvertOptions, dockerComposeFile ...string) error {
 	os.RemoveAll(config.OutputDir)
 
 	// create the chart directory
-	if err := os.MkdirAll(templateDir, 0o600); err != nil {
-		fmt.Println(utils.IconFailure, err)
-		os.Exit(1)
+	if err := os.MkdirAll(templateDir, utils.DirectoryPermission); err != nil {
+		return err
 	}
 
 	// add icon from the command line