Testing GHC against Hackage via CI

[Ryan Scott]

This is fantastic work! I'm looking forward to using this.

Are there plans to merge GitLab's fork of head.hackage back into the
upstream repo [1]? I ask since I regularly submit patches to upstream, but
if the GitLab CI is using the fork, then it may take some time for upstream
changes to make their way back to the fork.

Ryan S.
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[1] https://github.com/hvr/head.hackage
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