Windmill.dev fills this niche (it's AGPLv3, not MIT) and you can use it at scale for production use-case even on the open-source version.
- The queue is in postgres or redis.
- We scale to 0
- We have helm charts for k8s: https://github.com/windmill-labs/windmill-helm-charts
- We support cron and error handlers for cron as functions and we generate a webhook for each functions
- We support local dev and sync from github or deploy directly from our webide
- deployment of a function takes less than 1s