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/init.go

@@ -81,6 +81,7 @@ func GlobalInit(ctx context.Context) {
 	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("Run Mode: %s", strings.Title(setting.RunMode))
 
 	// Setup i18n