Too Long; Didn't Read
GitHub has an [application](https://github.com/integrations/slack) that you can add to your slack workspace. This app is nice and dandy if you want to get notified about \*\* all actions that happen on GitHub. But after digging more into Github, you can find an exciting feature **(scheduled reminders)** that could enable you only get notified for the PR you are requested to review, replies to your comments, or even commits...etc.