golang embed 代码
文件路径：/src/time/embed.go
/ Copyright 2020 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
/ This file is used with build tag timetzdata to embed tzdata into
/ the binary.
/go:build timetzdata
package time
import _ "time/tzdata"