Re: [PATCH v3 17/29] CI: split up and reduce "ci/test-documentation.sh"

> Change the "ci/test-documentation.sh" script to run the bash-specific
> parts in as one command in the CI job itself, and to run the two "make
> doc" commands at the top-level.
> 
> It'll now be obvious from the title of the step if if we failed in the
> asciidoc or asciidoctor step.

> Since the "check_unignored_build_artifacts()" function is now only
> used in "ci/check-unignored-build-artifacts.sh" move that function
> there.
> 
> The recipe for the job in ".github/workflows/main.yml" is now a bit
> verbose because it's effectively the same job twice, with a "make
> clean" in-between. It would be better for the verbosity to run it via
> a matrix as done in the alternate approach in [1] does, but then we'd
> sacrifice overall CPU time for the brevity. It might still be worth
> doing, but let's go for this simpler approach for now.
> 
> 1. https://lore.kernel.org/git/patch-v2-6.6-7c423c8283d-20211120T030848Z-avarab@gmail.com/
> 
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>