* The repo can add a `.ignore` or a `.rgignore` whitelisting things like `.github`. ripgrep will pick up that whitelist automatically and search `.github` even though it's hidden. But this relies on the repo adding ripgrep-specific config files, which is maybe not so realistic. (Or not universal enough to rely upon.) But it could work fine for repos under your control.

* Add '!.github/' to, e.g., `~/.config/ripgrep/ignore`, and then add `alias rg="--ignore-file ~/.config/ripgrep/ignore"`. That will become a global ignore file (with low precedent) that will whitelist `.github` everywhere.