[MacPorts] #47895: github portgroup: support the "archive" tarball_from category

[MacPorts]

#47895: github portgroup: support the "archive" tarball_from category
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 Reporter:  rjvbertin@…  |      Owner:  macports-tickets@…
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:
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 I've seen several github projects now that have their release tarballs in
 a directory under `archive`. The attached patch adds this category to
 `github.tarball_from`.

 PS: it'd be nice if PortGroups had a maintainer statement somewhere in
 their preamble comments.

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Ticket URL: <https://trac.macports.org/ticket/47895>
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