basic-01-environment.yml

name: "Basic 01: Environment"

on:
  push:
    branches:
      - master
      - basic-*
  pull_request:

jobs:
  read-context-and-vars:

    # See also:
    # - https://help.github.com/en/articles/workflow-syntax-for-github-actions#jobsjob_idstrategy
    # - https://help.github.com/en/articles/virtual-environments-for-github-actions#supported-virtual-environments
    strategy:
      matrix:
        os: [macOS-latest, ubuntu-latest]
    runs-on: ${{ matrix.os }} # runs on each `os`

    steps:
    # You can use the specific commit for action
    # ref. https://github.com/actions/checkout/commit/7f0669ca1fd955c0e0fd85ee8d5b8d16978be97e
    - uses: actions/checkout@7f0669ca1fd955c0e0fd85ee8d5b8d16978be97e
    - run: ls -al ${{ github.workspace }}

    - name: You can use "quote" 'and' `symbols` 😀
      run: echo 🍻

    - name: You can get GitHub Context
      run: echo ${GITHUB_CONTEXT} > /tmp/context.json
      env:
        GITHUB_CONTEXT: ${{ toJson(github) }}

    # See also:
    # - https://help.github.com/en/articles/virtual-environments-for-github-actions#environment-variables
    - name: You can use "default environment variables"
      run: echo ${GITHUB_REF}
    # See also:
    # - https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html
    - name: And you can use Bash Parameter Expansion
      run: echo ${GITHUB_REF#refs/*/}
    - run: echo ${GITHUB_REF%%/*}
    - run: echo ${GITHUB_REF+HasTheReference}
    - run: echo ${NULL_VAR:-Default}