[MacPorts] #69976: Set ports tree timestamps based on commit times

[MacPorts]

#69976: Set ports tree timestamps based on commit times
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  Reporter:  jmroot          |      Owner:  admin@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by jmroot):

 While you might want to ignore whitespace changes (though currently the
 logic for cleaning partial builds doesn't), there are plenty of other
 Portfile changes that do change the build result. If we want to use the
 last commit that is considered significant, then we probably have to store
 something like FreeBSD ports' TIMESTAMP.

 If OTOH we don't care about having timestamps that increase when and only
 when the build results change, but just having consistent results, well…
 using a fixed value is the most reproducible of all and is also very easy.

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Ticket URL: <https://trac.macports.org/ticket/69976#comment:4>
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