Send GH Actions Metrics to DataDog

Usage

1. Set your DataDog API Key as secret
2. Add the following as the very last item of your workflow

uses: MonarchEngineering/metrics-to-datadog-action@v1
if: always()
with:
  datadog-api-key: ${{ secrets.DD_API_KEY }}
  github-token: ${{ secrets.GITHUB_TOKEN }}
  status: ${{ job.status }}