CI: Add ghc-in-ghci build job
This is a separate build job to the other hadrian jobs as it only takes
about 2-3 minutes to run from cold. The CI tests that the
./hadrian/ghci script loads ghc/Main.hs successfully.
Marge Bot <ben+marge-bot@smart-cactus.org> | Mar 12 2019, 8:04 AM |