Always emit the configuration path (#17036)

Often when handling problems it is not clear which configuration file Gitea is
using. This PR simply ensures that the configuration file is emitted.

Signed-off-by: Andrew Thornton <art27@cantab.net>

routers/install/setting.go

@@ -22,6 +22,7 @@ func PreloadSettings(ctx context.Context) bool {
 		log.Info("AppWorkPath: %s", setting.AppWorkPath)
 		log.Info("Custom path: %s", setting.CustomPath)
 		log.Info("Log path: %s", setting.LogRootPath)
+		log.Info("Configuration file: %s", setting.CustomConf)
 		log.Info("Preparing to run install page")
 		translation.InitLocales()
 		if setting.EnableSQLite3 {