[clang-tools-extra] [llvm] [Github][CI] Add default gha user for tooling containers (PR #164294)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> Will delete it from Github once merged

Not sure you need to do that. It's just another tag among all the others in there.

https://github.com/llvm/llvm-project/pull/164294