[MacPorts] #56061: Add a lint job

[MacPorts]

#56061: Add a lint job
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 Reporter:  jmroot         |      Owner:  admin@…
     Type:  enhancement    |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
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 We used to have a post-commit hook that ran `port lint` on any changed
 portfiles and emailed the committer and maintainers if there were any
 errors. It would be nice to do something similar with buildbot.

 Preferably lint with all variants and platforms to catch things like a
 nonexistent dependency that is only added by a certain variant.

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Ticket URL: <https://trac.macports.org/ticket/56061>
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