[python-package] ignore pip cache dir in build-python.sh #5945
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Follow-up to #5907.
Tells
pip install
insh ./build-python.sh install
to:pip
cache dir (the placepip
puts.tar.gz
and.whl
files it downloads) when installingThis ensures that
build-python.sh install
will overwrite an existing installation oflightgbm
, even if it had been run previously in the same environment.