Don't store assets modified time into generated files (#18193)

modules/public/static.go

@@ -18,8 +18,14 @@ import (
 	"time"
 
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/timeutil"
 )
 
+// GlobalModTime provide a gloabl mod time for embedded asset files
+func GlobalModTime(filename string) time.Time {
+	return timeutil.GetExecutableModTime()
+}
+
 func fileSystem(dir string) http.FileSystem {
 	return Assets
 }