Add a new command doctor to check if some wrong configurations on gitea instance (#9095)

* add doctor

* Add a new command doctor to check if some wrong configurations on gitea instance

* fix import

* use regex match authorized_keys on doctor

* Add documentation

main.go

@@ -68,6 +68,7 @@ arguments - which can alternatively be run by running the subcommand web.`
 		cmd.CmdMigrate,
 		cmd.CmdKeys,
 		cmd.CmdConvert,
+		cmd.CmdDoctor,
 	}
 	// Now adjust these commands to add our global configuration options