I get questions about running Zeebe at “zero-scale”. That means workers that consume no resources when there are no tasks to perform.
The Zeebe service on Camunda Cloud includes a generic HTTP-Worker that can be used to achieve this. The HTTP-Worker polls for jobs of type “Camunda-HTTP”, and then invokes a REST endpoint based on the HTTP verb and URL set in the task headers. If you are not on Camunda Cloud you can use zeebe-http-worker, or just write your own.