[MacPorts] #62913: github: CI jobs: port dependency installation incredibly slow, severely impacting job runtime

[MacPorts]

#62913: github: CI jobs: port dependency installation incredibly slow, severely
impacting job runtime
----------------------------+----------------------
 Reporter:  mascguy         |      Owner:  admin@…
     Type:  defect          |     Status:  assigned
 Priority:  Normal          |  Milestone:
Component:  server/hosting  |    Version:
 Keywords:  github ci       |       Port:
----------------------------+----------------------
 Per discussion on the Dev mailing list during April 2021, port dependency
 installation within our GitHub CI jobs is incredibly slow. Enough so that
 it severely impacts the job runtime, and in the worst cases, it causes the
 jobs to be killed due to timeout. (The latter is presently six hours.)

 This also has a further cascade effect, causing CI jobs to be queued up.
 And increasing the wait time for PRs to be validated.

 This needs to be improved, if at all possible.

 Also see issue:62621, which covers dependency installation time for our
 buildbots.

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Ticket URL: <https://trac.macports.org/ticket/62913>
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