[GHC] #14505: CircleCI only builds pushed heads

[GHC]

#14505: CircleCI only builds pushed heads
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Continuous        |              Version:  8.2.1
  Integration                        |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by chak):

 Seems like we can sidestep this issue by using GitHub PRs instead of
 direct pushing to master, as per https://mail.haskell.org/pipermail/ghc-
 devops-group/2017-December/000129.html

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14505#comment:4>
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