Wondering if there any open source project which does similar things? (surprised if it's not)
you will need to glue together (and maintain) a bunch of different open-source projects to achieve the same capabilities - here are some: https://github.com/danger/danger-js, https://github.com/probot/probot, https://github.com/Yelp/detect-secrets, https://github.com/github/licensed, and many more...