[MacPorts] #72591: bazel: Directory /private/var/tmp/_bazel_macports exists

[MacPorts]

#72591: bazel: Directory /private/var/tmp/_bazel_macports exists
------------------------+-------------------------
 Reporter:  ryandesign  |      Owner:  missa-prime
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  bazel
------------------------+-------------------------
 A directory /private/var/tmp/_bazel_macports was found on the buildbot
 machines. The first one I found occupied 1.5 GB. I don't know whether this
 was created when building the bazel port or when the bazel software was
 used to build other ports, but we don't have room to store that amount of
 data on the build servers between builds. Please ensure that this data
 does not persist after the build is done. The easiest way to do this is to
 ensure that temporary information goes in $TMPDIR (rather than /var/tmp)
 because buildbot will automatically clean that up for you after the build
 is done.

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Ticket URL: <https://trac.macports.org/ticket/72591>
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