refactor(images): Move sponsor images to folder and load them dynamicly

services/templater.go

@@ -82,12 +82,11 @@ func (t *DefaultTemplater) GenerateBarcode(code string, format string, prefix st
 }
 
 func (t *DefaultTemplater) SelectSponsorImage(id int) (string, error) {
-	sponsors := []string{
-		"vrbank",
-		"odit",
-		"sparkasse",
+	sponsors, err := ListFilesInStaticSubFolder("images/sponsors")
+	if err != nil {
+		return "", err
 	}
-	return GetImage(sponsors[id%len(sponsors)]), nil
+	return GetImage("sponsors/" + strings.TrimSuffix(sponsors[id%len(sponsors)], ".base64")), nil
 }
 
 func (t *DefaultTemplater) LoadImage(name string) (string, error) {