[MacPorts] #54800: Set up a private server for archives that aren't distributable to speed up Travis CI builds (was: Cache built dependency packages on Travis CI to speed up testing flow)

[MacPorts]

#54800: Set up a private server for archives that aren't distributable to speed up
Travis CI builds
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  Reporter:  yan12125        |      Owner:  admin@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Ticket URL: <https://trac.macports.org/ticket/54800#comment:9>
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