health-check: mention failed systemd services

scripts/health-check

@@ -1,5 +1,5 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -i bash -p curl -p dig -p iputils -p lftp
+#!nix-shell -i bash -p curl -p dig -p iputils -p lftp -p openssh
 
 echo "this script will check that uninsane.org is baseline operational"
 echo "it doesn't check all services, just the most critical ones"
@@ -45,6 +45,10 @@ check "git.uninsane.org" git ls-remote origin --quiet
 
 check "ftp://uninsane.org" lftpget ftp://uninsane.org/README.md && rm README.md
 
+echo ""
+echo "systemctl --failed:"
+ssh uninsane.org systemctl -q --failed
+
 echo ""
 if [ $last_error -eq 0 ]; then
   echo "SUCCESS"