This Action can install Asciidoctor to a virtual machine of GitHub Actions.

Given that Ruby has already been installed (e.g. by ruby/setup-ruby), include this in your workflow:

 - uses: reitzig/[email protected]

These inputs are allowed:

• version -- a Gemfile-compatible version string
  Default: empty; installs the latest version.

name: Asciidoctor Demo

on:
  push:
    branches:
      - master

jobs:
  example:
    runs-on: ubuntu-18.04
    steps:
      - uses: actions/checkout@v3

      - uses: ruby/setup-ruby@v1
        with:
          ruby-version: 2.7

      - uses: reitzig/[email protected]
        with:
          version: 2.0.18

      - run: asciidoctor --version

• @peaceiris lent inspiration, example, and pointers.
• A bunch of Stackoverflow answers helped cobble this together.
• Parts of this project were created during 20% time graciously provided by codecentric. Thank you!