CI status

[Ben Gamari]

Hi everyone,

As you likely have noticed, GHC's CI is a bit of a mess since the
Hadrian merge, especially for differentials based on commits prior to
the merge. The problem is a tiresome limitation of Harbormaster's CI
strategy [1].

I have taken this opportunity to finally move testing of Differentials
to CircleCI. Unfortunately this has taken longer than anticipated due to
more tiresome Phabricator issues. At the moment the only guidance I can
offer for those in need of CI is to sit tight; the problem is being
worked on.

Cheers,

- Ben



[1] Namely, Harbormaster attempts to reuse working trees to perform
    builds. However, it fails to remove stale submodules, meaning any
    attempt to checkout a post-Hadrian-merge commit fails.
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