Doc improvement suggestion - the use of cljstyle in GitHub Actions workflows

[0918nobita]

Hi, thanks for developing and providing cljstyle.

Just recently, I developed and released a custom GitHub Action called "setup-cljstyle" to simplify the use of cljstyle in GitHub Actions workflows.
If possible, I would like to additionally write about setup-cljstyle in doc/integrations.md as well as the use of cljstyle in the CircleCI workflows.