[RunAllTests] Attempt to fix GitHub actions cache flake #3064
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Explanation
Flakes like this are now being observed after caching was introduced in #3035:
The variable format change probably won't make a difference, it's just a "correctness" thing per what I saw others doing. I'm hoping that using a bash shell will help, but I'm not confident. It's weird because it seems like echo is outputting the wrong data.
This fix is just experimental--I haven't actually found anyone hitting this problem yet.