[MacPorts] #57464: Builtbot: Don't keep huge ports installed

[MacPorts]

#57464: Builtbot: Don't keep huge ports installed
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  Reporter:  ryandesign     |      Owner:  admin@…
      Type:  enhancement    |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  buildbot/mpbb  |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by mojca):

 Btw: a rule that says "uninstall the port unless something depends on it"
 won't help you a tiny bit in case of Geant since:
 * `geant4.x` depends on `geant4.x-data`
 * `gate` depends on `geant4.x`
 So in case of geant: feel free to delete both (times different versions of
 geant, so probably 12 ports). We should keep `geant4.x` on the binary
 package server, but it does absolutely nothing useful on the builder. I
 may also remove the older versions one day.

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Ticket URL: <https://trac.macports.org/ticket/57464#comment:4>
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