Commit 56e8c6fc authored by Committed by Ben Gamari
Update docker images to use GHC 8.4.2 and cabal-install-2.2
The ‘haskell’ images are not being updated and there is no image with GHC 8.4.2, so we probably should not use them anymore. I adapted Dockerfiles used by those images so the end result is almost the same except we get newer GHC and cabal-install.
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