[llvm] [GitHub] Set top level token permission (PR #87326)

[Marius Brehler via llvm-commits]

marbre wrote:

> @marbre Are you planning to commit this?

After @tru's feedback I planned to take a more careful look before commiting this. Unfortunately, I had other things on my list last week and I am currently at EuroLLVM.
However, if you think that we shouldn't care too much if things break by the patch and if it would be okay to fix it afterwards we can already go ahead with this.

https://github.com/llvm/llvm-project/pull/87326