refactor Dockerfile to streamline build process and remove unnecessary dependencies

main.go

@@ -17,6 +17,7 @@ func main() {
 	h.Use(func(ctx context.Context, c *app.RequestContext) {
 		host := string(c.Host())
 		if strings.HasSuffix(host, OldDomain) {
+			c.Header("X-Redirected-By", "liteyuki.org")
 			newHost := strings.TrimSuffix(host, OldDomain) + NewDomain
 			scheme := "https"
 			if proto := c.Request.Header.Get("X-Forwarded-Proto"); len(proto) > 0 {