Manage asciidoctor with bundler

[peaceiris]

I enhanced the workflow for fast execution!

Issue: peaceiris/actions-hugo#342
ruby/setup-ruby: https://github.com/ruby/setup-ruby
bundle command: https://bundler.io/

Actions log (Completed in 12s) : https://github.com/peaceiris/today-i-learned/runs/711724694?check_suite_focus=true

[reitzig]

Love the "magic" of the deploy action so that it tests the build but doesn't deploy on non-master branches! Didn't realize that was the case, thanks!

[reitzig]

@peaceiris, what do you think of actions-asciidoctor instead? 😬

Unfortunately, while that form of asciidoctor hack seems to work, here it fails:

fork/exec /home/runner/work/today-i-learned/today-i-learned/actions_asciidoctor/asciidoctor: exec format error

[peaceiris]

OK. It passed.

https://github.com/reitzig/today-i-learned/runs/720322514

[reitzig]

Good alternative, thanks!

I'll stick to the action for now (and hope for future simplications regarding ruby setup).

Cheers!