I've been doing this for decades and I don't even know what an Xcode dotfile is. Maybe you mean .DS_Store files? That's probably best described as a Finder dot

I've been doing this for decades and I don't even know what an Xcode dotfile is. Maybe you mean .DS_Store files? That's probably best described as a Finder dotfile... For that, maybe just add the line ".DS_Store" to your .gitignore (or the equivalent for your SCM software)?