Spurious failures due to intermittent stack concurrency bug
We have spurious failures because of https://github.com/commercialhaskell/stack/issues/6388.
What's not clear to me is why a package that required a call to updateHackageIndex
in one run did not require the call in a different run. I would expect the set of packages that trigger the call to be fixed. Are we caching the Pantry database?