internal/router/dnsmasq: disable cache

So multiple upstreams config could work properly.

internal/router/firewalla/firewalla.go

@@ -65,6 +65,11 @@ func (f *Firewalla) Setup() error {
 		return fmt.Errorf("writing ctrld config: %w", err)
 	}
 
+	// Disable dnsmasq cache.
+	if err := dnsmasq.FirewallaDisableCache(); err != nil {
+		return err
+	}
+
 	// Restart dnsmasq service.
 	if err := restartDNSMasq(); err != nil {
 		return fmt.Errorf("restartDNSMasq: %w", err)
@@ -82,6 +87,11 @@ func (f *Firewalla) Cleanup() error {
 		return fmt.Errorf("removing ctrld config: %w", err)
 	}
 
+	// Enable dnsmasq cache.
+	if err := dnsmasq.FirewallaEnableCache(); err != nil {
+		return err
+	}
+
 	// Restart dnsmasq service.
 	if err := restartDNSMasq(); err != nil {
 		return fmt.Errorf("restartDNSMasq: %w", err)