monit: restart onlyoffice if failed

this should hopefully help with our consistent onlyoffice-does-not-work-but-no-one-noticed
problems (yes, monit runs as root and can do that).

"then restart" will still send an alert if it restarted the unit (see monit's man page)

parsons/mail.nix

@@ -22,11 +22,10 @@
       alertAddress = "admin@hacc.space";
       config = (lib.replaceStrings ["port 22"] ["port ${toString (lib.head config.services.openssh.ports)}"] options.mailserver.monitoring.config.default) + ''
         check host onlyoffice with address onlyoffice.infra4future.de
-              if failed
-                 port 443
-                 protocol https
-                 status = 302
-              then alert
+              start program "/run/current-system/sw/bin/lxc-start onlyoffice"
+              stop program "/run/current-system/sw/bin/lxc-stop onlyoffice"
+              if failed port 443 protocol https status = 302
+              then restart
       '';
     };
     domains = [