It's seems that I cannot set the wait_interval to a custom value. If I set it to 20 in my github workflow, it still uses the default of 10 seconds.

I'm pretty new to github actions, but I would guess the problem is, that entrypoint.sh#L16 wants to read the environment variable "INPUT_WAITING_INTERVAL" instead of the declared action input wait_interval in action.yml#L35.