arrow

ARROW-8724: [Packaging][deb][RPM] Use directory in host as build directory

Travis CI uses different partition for workspace (/) and
Docker (/var/lib/docker/) and /var/lib/docker/ doesn't have enough
disk space. If we use directory in host as build directory, we can use
disk space in /.

Closes #7118 from kou/packaging-linux-build-in-host-directory

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>