matrix-spec-proposals/.github/workflows/netlify.yaml

# GHA workflow which publishes previews of spec PRs to netlify.
#
# We keep this in a separate workflow to the main spec build, because it
# requires access to the Netlify secret. By having it run on `workflow_run`, we
# will only use the workflow definition file on the default branch, so we can
# ensure that the secret can't be exfiltrated.
#

name: Upload Preview Build to Netlify
on:
  workflow_run:
    workflows: [Spec]
    types: [completed]

jobs:
  build:
    runs-on: ubuntu-latest
    if: github.event.workflow_run.conclusion == 'success' && github.event.workflow_run.event == 'pull_request'
    steps:
      - name: "🔍 Read PR number"
        id: readctx
        run: |
                    echo "::set-output name=prnumber::${{ github.event.workflow_run.pull_requests[0].number }}"
        
      - name: '📥 Download artifact'
        uses: dawidd6/action-download-artifact@af92a8455a59214b7b932932f2662fdefbd78126 # v2.15.0
        with:
          workflow: main.yaml
          run_id: ${{ github.event.workflow_run.id }}
          name: spec-artifact

      - name: "📤 Deploy to Netlify"
        id: netlify
        # v1.2.2
        uses: nwtgck/actions-netlify@f517512ae75beec8896aa7b027c1c72f01816200
        with:
          publish-dir: spec
          deploy-message: "Deploy from GitHub Actions"
          enable-pull-request-comment: false
          enable-commit-comment: false
          alias: pr${{ github.event.workflow_run.pull_requests[0].number }}
        env:
          NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
        timeout-minutes: 1

      - name: "📝 Edit PR Description"
        # v1.0.1
        uses: velas/pr-description@3e19bf4239eecaf552a1c24ee730da2ba84b41cf
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          pull-request-number: ${{ github.event.workflow_run.pull_requests[0].number }}
          description-message: |
                        Preview: ${{ steps.netlify.outputs.deploy-url }}