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Backport #19317 - Warn on SSH connection for incorrect configuration - When `setting.RepoRootPath` cannot be found(most likely due to incorrect configuration) show "Gitea: Incorrect configuration" on the client-side to help easier with debugging the problem. Co-authored-by: delvh <dev.lh@web.de> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com> Co-authored-by: techknowlogick <techknowlogick@gitea.io>