Commit 0fc1cb54 authored by Ben Gamari's avatar Ben Gamari 🐢 Committed by Marge Bot

gitlab-ci: Verify that Hadrian builds with Stack

As noted in #18726, this regularly breaks. Let's test it.

Note that we don't actually perform a build of GHC itself; we merely
test that the Hadrian executable builds and works (by invoking `hadrian
parent 8f4f5794
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