* ignore copying frontend/dist folder - otherwise whatever you build in docker will get overridden by local build artifacts if any exist in frontend/dist
* support configuring redis with POSTHOG_REDIS_HOST and other vars in addition to REDIS_URL
* remove "the next version" in worker requirement modal
* split beat and celery scripts
* remove chart folder
* celery heartbeat every 10sec, reduce distributed beat lock hold time
* remove dockerfile local link
* add localhost redis url for tests
