[MacPorts] #54800: Cache built dependency packages on Travis CI to speed up testing flow

[MacPorts]

#54800: Cache built dependency packages on Travis CI to speed up testing flow
-----------------------------+---------------------
  Reporter:  yan12125        |      Owner:  admin@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
-----------------------------+---------------------

Comment (by l2dy):

 Travis CI cache is not suitable for this (hard to implement, too many
 constraints).

 Hosting these binaries on a private (limiting access to Travis CI VMs
 only) server technically works but I'm not a lawyer so...

--
Ticket URL: <https://trac.macports.org/ticket/54800#comment:5>
MacPorts <https://www.macports.org/>
Ports system for macOS