[MacPorts] #52765: buildbot: implement "successcache"

[MacPorts]

#52765: buildbot: implement "successcache"
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  Reporter:  ryandesign      |      Owner:  admin@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:  buildbot
      Port:                  |
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Comment (by larryv):

 Josh to the rescue: https://github.com/macports/mpbb/pull/1

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Ticket URL: <https://trac.macports.org/ticket/52765#comment:4>
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