Set CMAKE_BUILD_PARALLEL_LEVEL so that NUM_THREADS gets passed to the arrow build in CI #1764
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I realised that moving the arrow build in #1752 into the configure step means that it no longer respects the number of threads set in CI. However, the number of threads used can also be configured via the
CMAKE_BUILD_PARALLEL_LEVEL
environment variable, so I've set up the makefile to set that based on the value ofNUM_THREADS
.