[FEAT]: Add fail_on_error option to suppress failing

[Uzlopak]

Describe the need

I have a workflow, where i remove a label from a PR. It would be good to add an option to the action.yml which just outputs a warning and not a failure, so e.g. if the label is already removed it does not show an error in the overview.

If we agree on the name of the option, I would provide a PR.

SDK Version

No response

API Version

No response

Relevant log output

No response

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

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[andy-maier]

I would like to second this request.

We have a workflow that determines whether a release exists:

    - name: Determine whether release on Github exists for the pushed tag
      id: set-release-exists
      uses: octokit/request-action@v2.x
      with:
        route: GET /repos/${{ github.repository }}/releases/tags/${{ steps.set-tag.outputs.result }}
      continue-on-error: true
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

When the release does not exist, the plugin errors out with HTTP status 404, but the continue-on-error: true causes the job to continue, and we can access the status output of this step as a condition in subsequent steps.

So the functionality works - however, we get the error reported in the actions summary, which looks bad:

Build and publish to PyPI
Not Found - https://docs.github.com/rest/releases/releases#get-a-release-by-tag-name

When the new option is specified to the plugin, any error status (e.g. 404) should no longer be returned as an error, but should still be accessible in the status output parameter.

Our complete workflow is here: https://github.com/zhmcclient/python-zhmcclient/blob/master/.github/workflows/publish.yml

[andy-maier]

@Uzlopak Aras, if you are still willing to create a PR for this, I guess an option named "fail_on_error" with a default of true would be a good start. If the project owners want something different, it will come up in the PR review.