GitHub Action CI: Add Go source file format check (#6090)

https://github.com/XTLS/Xray-core/pull/6057#issuecomment-4364819830

And https://github.com/XTLS/Xray-core/pull/6149#issuecomment-4546876261

proxy/vmess/inbound/inbound.go

@@ -138,7 +138,8 @@ func New(ctx context.Context, config *Config) (*Handler, error) {
 func (h *Handler) Close() error {
 	return errors.Combine(
 		h.sessionHistory.Close(),
-		common.Close(h.usersByEmail))
+		common.Close(h.usersByEmail),
+	)
 }
 
 // Network implements proxy.Inbound.Network().