[MacPorts] #62530: pull request CI checks are marked successful even when they fail

[MacPorts]

#62530: pull request CI checks are marked successful even when they fail
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  Reporter:  ryandesign     |      Owner:  admin@…
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  buildbot/mpbb  |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by neverpanic):

 Unfortunately the return code of `port lint` is the same independent of
 whether it detected errors or warnings, so failing on error only isn't
 simple.

 Feel free to make the change I described to fix the behavior as discussed.
 I just didn't have time to do it myself.

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Ticket URL: <https://trac.macports.org/ticket/62530#comment:4>
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