Our "documentation" job has recently stopped working with the following
error:
+ sudo gem install --version 1.5.8 asciidoctor
+ gem install --version 1.5.8 asciidoctor
./ci/install-dependencies.sh: 23: gem: not found
The root cause of this is that we never explicitly install Ruby, and
consequently gem(1) isn't explicitly pulled in, either. This used to
work alright because we transitively pulled in Ruby via asciidoc. But
due to an update it seems that we stopped pulling in the transitive
dependency, and consequently we don't have gem(1) available anymore.
Fix this by explicitly installing Ruby.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
691dc53e2a