[MacPorts] #37130: github portgroup: github.tarball_from downloads should set livecheck.url

[MacPorts]

#37130: github portgroup: github.tarball_from downloads should set livecheck.url
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  Reporter:  aronnax@…    |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.2
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign@…):

 Replying to [comment:1 ryandesign@…]:
 > Your projects have tags, so why not let the default github portgroup
 livecheck use those?

 As in the attached patches.

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Ticket URL: <https://trac.macports.org/ticket/37130#comment:2>
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