[CI][Debian] rsync is missing

[asfimport]

https://github.com/ursacomputing/crossbow/runs/4415960154?check_suite_focus=true

+ mkdir -p /build/docs/c_glib
+ rsync -a /usr/local/share/gtk-doc/html/ /build/docs/c_glib
/arrow/ci/scripts/c_glib_build.sh: line 52: rsync: command not found
127

Reporter: Kouhei Sutou / @kou
Assignee: Kouhei Sutou / @kou

Related issues:

• [CI][Docs] Exercise documentation builds on the main branch (is related to)

PRs and other links:

• GitHub Pull Request #11859

_{Note: This issue was originally created as ARROW-14984. Please see the migration documentation for further details.}

[asfimport]

Kouhei Sutou / @kou:
Issue resolved by pull request 11859
#11859