[MacPorts] #59538: github portgroup doesn't work with default master_sites from other portgroups

[MacPorts]

#59538: github portgroup doesn't work with default master_sites from other
portgroups
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  Reporter:  jmroot  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by jmroot):

 Unfortunately we need a fix for right now too. If github.setup set a
 default, that would work, but it doesn't. My expectation would be that
 github.setup changes master_sites so that the distfiles will be downloaded
 from github. If it used default, that would solve the problem from #33826
 too. (Though I note that if you set github.tarball_from before changing
 git.branch, you would still see that problem to this day.)

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Ticket URL: <https://trac.macports.org/ticket/59538#comment:4>
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