Fix startup if scheme is missing in server URL

If the scheme in the server URL is missing 'http' is added as default
scheme and the url is parsed again. With this behaviour the user does
not need to enter the scheme if it would be 'http'.

pkg/controller/controller.go

@@ -37,11 +37,16 @@ func NewController(ctx context.Context) *Controller {
 	if err != nil {
 		log.Fatal().Err(err).Send()
 	}
-	url, err := url.Parse(settings.ServerURL)
+
+	u, err := url.Parse(settings.ServerURL)
+	if len(u.Host) == 0 {
+		u, err = url.Parse("http://" + settings.ServerURL)
+	}
 	if err != nil {
 		log.Fatal().Err(err).Str("url", settings.ServerURL).Msg("failed to parse server URL")
 	}
-	client := api.NewClient(url, timeout)
+
+	client := api.NewClient(u, timeout)
 	if err != nil {
 		log.Fatal().Err(err).Msg("failed to create API client")
 	}