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Antoine Pitrou authored and Krisztián Szűcs committed 0c02ff9c67d
ARROW-12112: [CI] Reduce footprint of conda-integration image This seems to save about 2GB in the image's root directory. Closes #9891 from pitrou/ARROW-12191-conda-integration Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>