steps:
- uses: actions/checkout@v1

- run: mkdir -p path/to/artifact

- run: echo hello > path/to/artifact/world.txt

- uses: actions/upload-artifact@v1
  with:
    name: my-artifact
    path: path/to/artifact

To upload artifacts only when the previous step of a job failed, use if: failure():

- uses: actions/upload-artifact@v1
  if: failure()
  with:
    name: my-artifact
    path: path/to/artifact

Where does the upload go?

In the top right corner of a workflow run, once the run is over, if you used this action, there will be a Artifacts dropdown which you can download items from. Here's a screenshot of what it looks like

License

The scripts and documentation in this project are released under the MIT License