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Sutou Kouhei authored and GitHub committed 2a9c8b1bda4
GH-36837: [CI][RPM] Use multi-cores to install gems (#36838) ### Rationale for this change We may reduce test time by using multi-cores to install gems. ### What changes are included in this PR? `gem install` with `MAKEFLAGS=-j$(nproc)` uses multi-cores when building extension libraries. ### Are these changes tested? Yes. ### Are there any user-facing changes? No. * Closes: #36837 Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>