publish.yml

name: Build & Publish Ruby Gem
# Gets triggered upon the creation of a new tag
on:
  push:
    tags:
    - 'v*' # Matches tags with the name "v*", i.e. v1.0, v20.15.10
# Performs the following steps:
#   - Sets the environment up
#   - Builds the gem
#   - Uploads the gem to RubyGem
#   - Creates a GitHub release and attaches the gem to it
jobs:
  build:
    name: Build + Publish
    runs-on: ubuntu-latest

    steps:
    - name: Checkout code
      id: checkout_code
      uses: actions/checkout@v2

    - name: Set up Ruby 2.6
      id: setup_ruby
      uses: actions/setup-ruby@v1
      with:
        version: 2.6.x

    - name: Publish to RubyGems
      id: publish_rubygems
      run: |
        mkdir -p $HOME/.gem
        touch $HOME/.gem/credentials
        chmod 0600 $HOME/.gem/credentials
        echo "---" >> $HOME/.gem/credentials
        echo ":rubygems_api_key: ${RUBYGEMS_API_KEY}" >> $HOME/.gem/credentials
        gem build *.gemspec
        gem push *.gem
        mv *.gem jekyll-theme-conference.gem
      env:
        RUBYGEMS_API_KEY: ${{secrets.RUBYGEMS_API_KEY}}

    - name: Create Release
      id: create_release
      uses: actions/create-release@v1
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      with:
        tag_name: ${{ github.ref }}
        release_name: Release ${{ github.ref }}
        draft: false
        prerelease: false

    - name: Upload Gem as Release Asset
      id: upload_asset_release
      uses: actions/upload-release-asset@v1
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      with:
        # This pulls from the CREATE RELEASE step above, referencing it's ID
        # to get its outputs object, which include a `upload_url`. See this
        # blog post for more info:
        # https://jasonet.co/posts/new-features-of-github-actions/#passing-data-to-future-steps
        upload_url: ${{ steps.create_release.outputs.upload_url }}
        asset_path: ./jekyll-theme-conference.gem
        asset_name: jekyll-theme-conference.gem
        asset_content_type: application/x-tar