main.yml

# Whenever a push is made to the master branch then run the job
on:
  push:
    tags:
      - 'v*'

jobs:
  # job id, can be anything
  export_game:
    # Always use ubuntu-latest for this action
    runs-on: ubuntu-latest
    # Job name, can be anything
    name: Export Game Job
    steps:
      # Always include the checkout step so that
      # your project is available for Godot to export
      - name: checkout
        uses: actions/checkout@v2.3.1
        # Ensure that you get the entire project history
        with:
          fetch-depth: 0
        # separate step to extract the version from the tag name
      - name: get tag from version
        id: tag_version
        run: |
          echo ::set-output name=TAG_VERSION::${GITHUB_REF#refs/tags/v}
      - name: export game
        # Use latest version (see releases for all versions)
        uses: firebelley/godot-export@v2.8.1
        with:
          # Defining all the required inputs
          # I used the mono version of Godot in this example
          godot_executable_download_url: https://downloads.tuxfamily.org/godotengine/3.3.3/Godot_v3.3.3-stable_linux_headless.64.zip
          godot_export_templates_download_url: https://downloads.tuxfamily.org/godotengine/3.3.3/Godot_v3.3.3-stable_export_templates.tpz
          create_release: true
          base_version: ${{ steps.tag_version.outputs.TAG_VERSION}}
          relative_project_path: ./
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}