demo-02.yml

# I am a basic workflow that does a matrix build

# Display name of workflow
name: Demo 02 - Matrix Builds



# Controls when the action will run. Workflow runs when manually triggered using the UI or API.
on:
  workflow_dispatch:
    # Inputs the workflow accepts.
    inputs:
      name:
        # Friendly description to be shown in the UI instead of 'name'
        description: 'Person to greet'
        # Default value if no value is explicitly provided
        default: 'World'
        # Input has to be provided for the workflow to run
        required: true

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "greet"
  greet:
    # Defines the matrix strategy to be used
    strategy:
      matrix:
        os:
          - ubuntu-latest
          - macos-latest
          - windows-latest
# THE FOLLOWING LINE SHOULD BE COMMENTED OUT AT THE BEGINNING OF THE DEMO
        python: [2.7, 3.6, 3.8]
    runs-on: ${{ matrix.os }}  # uses the variable defined in the matrix to set the runs-on statement

    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
    # Runs a single command using the runners shell
    - name: Send greeting
      run: |
        echo "Hello ${{ github.event.inputs.name }}"
        echo "Python ver ${{ matrix.python }}"