Puma: How to force a single threaded boot in development

Puma allows you to specify the max and min threads. In development this could be useful if you use a debugger, but do not want to overflow the console with other request like from ActionCable. Then just set the max threads to 1 and the other requests have to wait.

WORKER_TIMEOUT=1000 puma -t 0:1 -w 1 -p 3000