Web service with configurable button to run commands?

Maybe I imagined it, but I thought a few months or so ago I saw someone mention a service that allows you to create a single button on a webpage that can run a command on the host machine. e.g. so I could create a button that just runs “sudo shutdown now”, for example. That way when I need to turn off my Docker host remotely, I can do so just using my phone, rather than having to go to my computer, turn that on, log into my Docker host via SSH, and then shut it down.

Is this a thing?