Add support for deployment_status events to github action

[carbonrobot]

Support the deployment_status event type for Github Actions.

This allows consumers to support running Playwright or Cypress tests after a deployment is complete to a third party platform such as Vercel when using the action in the same workflow file.

Fixes #647

Example Configuration

The following configuration currently exits with an error for unsupported event type. This PR fixes the error.

name: Chromatic

on:
  deployment_status:
  
jobs:
  playwright:
    container:
      image: mcr.microsoft.com/playwright:v1.49.0-jammy
    steps:
      - uses: actions/checkout@v4
      
      - name: Run Playwright Tests
        run: npx playwright test
        env:
          PLAYWRIGHT_TEST_BASE_URL: ${{ github.event.deployment_status.target_url }}
          
      - uses: actions/upload-artifact@v4
        if: always()
        with:
          name: playwright-results
          path: ./playwright-report
          retention-days: 30

  chromatic:
    name: Run Chromatic
    needs: playwright
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4 
      
      - uses: actions/download-artifact@v4
        with:
          path: ${{ github.workspace }}
          
      - name: Chromatic
        uses: chromaui/action@latest
        with:
          playwright: true
          projectToken: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}

[carbonrobot]

Currently blocked by the same problem with deployment_status missing the branch ref as describe in actions/cache#319; but exploring workarounds.

[ImranSefat]

@carbonrobot hey, we are having the exact same problem on the deployment status check. Did you find a workaround for this with chromatic? Thanks!

[carbonrobot]

@ImranSefat We explored a few different options, but ultimately the data is simply not there in the trigger without writing an entire custom script to get it using git commands. And even then, the consistency was not reliable.

[ethriel3695]

I explained the reason for a duplicate PR here:
#1165