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build: make CI faster, magic contained within #21086
So I tried a lot of things here, mostly based off of the idea @jkleinsc had around caching and restoring the out directory. On linux that works really well, on macOS the network speed is lower (appears to be only gigabit) so we have to make trade offs around out size vs cache upload / download time.
I think I found the sweet spot. Raising this PR for
Build time estimates are: