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

Include this in your workflow:

 - uses: oldes/[email protected]

These inputs are allowed:

• version -- an available Rebol release version (for example: 3.18.0) Default: empty; installs Rebol version 3.18.0.
• product -- one of available product build types (base, core or bulk) Default: empty; installs the core version.

name: Rebol Demo

on:
  push:
    branches:
      - master

jobs:
  build:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: ["ubuntu-latest", "windows-latest", "macos-latest"]
    steps:
    - uses: actions/checkout@v3
    - uses: oldes/[email protected]
    - name: Test Rebol
      run: ./rebol3 -v
      shell: bash

Real life usage example can be seen for example at this Build Rebol workflow.