Upload assets

Sample

This uses the Upload Release Asset action and the sample is based on the README file example.

This runs when a tag starting with v is created.

If you need to compile for Windows, macOS and Linux separately, you could run this multiple times using runs-on or similar. Maybe your tool supports cross-platform compilation on a single OS already.

• release.yml

    name: Upload Release Asset
      
    on:
      push:
        tags:
        - 'v*'
  
    jobs:
      build:
        name: Upload Release Asset
  
        runs-on: ubuntu-latest
  
        steps:
          - name: Checkout code
            uses: actions/checkout@v2
              
          - name: Build project
            # This would really build your project, here using zip for an example artifact.
            run: zip --junk-paths my-artifact README.md
                
          - 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 Release Asset
            id: upload-release-asset 
            uses: actions/upload-release-asset@v1
            env:
              GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
            with:
              upload_url: ${{ steps.create_release.outputs.upload_url }}
              asset_path: my-artifact.zip
              asset_name: my-artifact.zip
              asset_content_type: application/zip
  

Note on upload URL:

This pulls from the CREATE RELEASE step above, referencing its ID to get its outputs object, which include a upload_url. See this blog post for more info: link