matrix.yml

# This is a basic workflow to help you get started with Actions

name: Matrix Example

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

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

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  build:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-18.04, ubuntu-20.04]
        node: [10, 12, 14]
    steps:
    - uses: actions/setup-node@v2
      with:
        node-version: ${{ matrix.node }}