[MacPorts] #56055: Support creating MacPorts pkg/dmg by using 'pkg' and 'dmg' targets in the base builds system

[MacPorts]

#56055: Support creating MacPorts pkg/dmg by using 'pkg' and 'dmg' targets in the
base builds system
-------------------------+-----------------
 Reporter:  neverpanic   |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:               |       Port:
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 Do not use MacPorts port to produce the pkg/dmg, use a `make pkg` target
 in the build system instead. This would allow us to automate release
 creation more, since we could build a base dmg/pkg on the buildbot
 (#51996).

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Ticket URL: <https://trac.macports.org/ticket/56055>
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