[MacPorts] #38720: Add a port for bup (https://github.com/bup/bup)

[MacPorts]

#38720: Add a port for bup (https://github.com/bup/bup)
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  Reporter:  mail@…   |      Owner:  macports-tickets@…
      Type:  request  |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  bup      |
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Comment (by egall@…):

 Replying to [comment:8 mail@…]:
 > Whats this github portgroup?
 browser:trunk/dports/_resources/port1.0/group/github-1.0.tcl
 > How to use it?
 in this case, put this at the top of your portfile, after the `PortSystem
 1.0` line:
 {{{
 PortGroup              github 1.0

 github.setup           bup bup 0.25-rc1 bup-
 }}}

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Ticket URL: <https://trac.macports.org/ticket/38720#comment:9>
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