asciidoctor-chart and gnuplot support

[zakutok]

I would like to use https://github.com/asciidoctor/asciidoctor-chart or gnuplot to draw charts. Could you please clarify how to make them work?

I've tried it with the config:

name: GitHub Pages Publish

# Controls when the action will run. Triggers the workflow on push or pull request
# events but only for the master branch
on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
permissions:
  contents: write
  pages: write
  id-token: write

  # Allow one concurrent deployment
concurrency:
  group: "pages"
  cancel-in-progress: true

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  build_and_deploy:
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    # The type of runner that the job will run on
    runs-on: ubuntu-latest

    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - uses: actions/checkout@v3

      - name: install rouge
        run: sudo apt-get install -y ruby-rouge

      - name: install gnuplot
        run: sudo apt-get install -y gnuplot

      - name: install asciidoctor-chart
        run: sudo gem install asciidoctor-chart --pre

      # Includes the AsciiDoctor GitHub Pages Action to convert adoc files to html and publish to gh-pages branch
      - name: asciidoctor-ghpages
        uses: manoelcampos/[email protected]
        with:
          pdf_build: true
          asciidoctor_params: -r asciidoctor-diagram --attribute=nofooter
          # adoc_file_ext: .ascii # default is .adoc
          # source_dir: docs/ # default is .
          # slides_build: true
          # pre_build:
          # post_build:
      - name: Setup Pages
        uses: actions/configure-pages@v2
      - name: Upload artifact
        uses: actions/upload-pages-artifact@v1
        with:
          # Upload entire repository
          path: '.'
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v1

but it throw the error:
Could not find the 'gnuplot' executable in PATH; add it to the PATH or specify its location using the 'gnuplot' document attribute
Then I made asciidoctor_params: -r asciidoctor-diagram --attribute=nofooter a gnuplot=/usr/bin/gnuplot but it throws the same error.
So I made asciidoctor_params: -r asciidoctor-diagram -r asciidoctor-chart --attribute=nofooter -a gnuplot=/usr/bin/gnuplot but it throws asciidoctor: FAILED: 'asciidoctor-chart' could not be loaded error