Commit f44c7e67 authored by Ben Gamari's avatar Ben Gamari 🐢 Committed by Marge Bot

gitlab-ci: Avoid duplicating ~/.cabal contents with every build

Previously our attempt to cache the cabal store would
`cp cabal-cache ~/.cabal`. However, if the latter already
 existed this meant that we would end up with
~/.cabal/cabal-cache. Not only would this not help caching
but it would exponentially grow the size of ~/.cabal. Not
parent 05251b17
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