[MacPorts] #69661: Disable Homebrew on Apple Silicon GitHub Actions CI runners

[MacPorts]

#69661: Disable Homebrew on Apple Silicon GitHub Actions CI runners
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  Reporter:  ryandesign      |      Owner:  admin@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by ryandesign):

 I guess that's not due to bootstrap.sh; it's a separate problem to be
 fixed in source:macports-base/.github/workflows/main.yml

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Ticket URL: <https://trac.macports.org/ticket/69661#comment:3>
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