build.yaml

name: Dynamic Matrix from config.yaml

on:
  push:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-20.04

    # Use this action to check out the code so we can read the config.yaml
    steps:
    - name: Check out code
      uses: actions/checkout@v2

    - name: Install yq
      run: |
        sudo wget https://github.com/mikefarah/yq/releases/download/v4.2.0/yq_linux_amd64 -O /usr/bin/yq
        sudo chmod +x /usr/bin/yq

    # Read the config.yaml file and set the versions as an output
    - name: Get versions from config.yaml
      id: get_versions
      run: |
        echo "versions=$(yq -j -I=0 eval '.versions' config.yaml)" >> $GITHUB_OUTPUT

    # Print matrix for debugging purposes (Optional)
    - name: Print matrix
      run: echo "${{ steps.get_versions.outputs.versions }}"
    outputs:
      # Will look like '["6.0.0rc1", "5.3.2"]'
      versions: ${{ toJSON(steps.get_versions.outputs.versions) }}
  # Use the dynamic matrix
  matrix-from-config:
    needs: build
    runs-on: ubuntu-20.04
    strategy:
      matrix: ${{ fromJson(needs.build.outputs.versions) }}
    steps:
    - name: Run job for matrix element
      run: |
        echo "Running for version: ${{ matrix }}"