For more details on sloctl visit its repository.
How it works? Quoting Homebrew docs:
A tap is just a Git repository so you don’t have to do anything specific when making modifications, apart from committing and pushing your changes.
Once your tap is installed, Homebrew will update it each time a user runs brew update. Outdated formulae will be upgraded when a user runs brew upgrade, like core formulae.
The tap is updated by Goreleaser which in turn is configured and run in sloctl repository on every official release.