response to workflow_run event

[swfz]

Added option to retrieve the status of the last workflow job when using workflow_run event for notification.

If you have more than one workflow file, you will need to write the Slack notification settings in the workflow configuration file each time.

We have prepared workflow files to be notified using the workflow_run event, and made it possible to specify the target workflows to be notified.

This method of notification using workflow_run is also useful in cases where dependabot notification fails

Configuration example

on:
  workflow_run:
    workflows:
      - lint
      - test
    types:
      - completed
jobs:
  main:
    name: main
    runs-on: ubuntu-20.04
    steps:
      - uses: swfz/slack-workflow-status@feature/follow-workflow-run
        with:
          workflow_run: true
          repo_token: ${{ secrets.GITHUB_TOKEN }}
          slack_webhook_url: ${{ secrets.SLACK_WEBHOOK_URL }}