pr-preview-deploy.yml

name: Deploy PR Preview

on:
  workflow_run:
    workflows: ["Continuous Integration"]
    types: [completed]

permissions:
  actions: read
  contents: read
  # Write sticky comment
  pull-requests: write

env:
  CLOUDFLARE_PAGES_PROJECT_NAME: typelevel-website

jobs:
  deploy:
    name: Publish to Cloudflare Pages
    runs-on: ubuntu-latest
    if: >
      github.event.workflow_run.event == 'pull_request' &&
      github.event.workflow_run.conclusion == 'success'
    steps:
      - name: Download site artifact
        uses: actions/download-artifact@v4
        with:
          name: site
          path: site
          run-id: ${{ github.event.workflow_run.id }}
          github-token: ${{ secrets.GITHUB_TOKEN }}
      - name: Download PR number artifact
        uses: actions/download-artifact@v4
        with:
          name: pr-number
          path: .
          run-id: ${{ github.event.workflow_run.id }}
          github-token: ${{ secrets.GITHUB_TOKEN }}
      - name: Read PR number
        id: pr
        run: |
          echo "pr=$(cat pr_number.txt)" >> "$GITHUB_OUTPUT"
          echo "branch=pr-$(cat pr_number.txt)" >> "$GITHUB_OUTPUT"

      - name: Deploy
        uses: cloudflare/wrangler-action@v4
        id: deploy
        with:
          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          gitHubToken: ${{ secrets.GITHUB_TOKEN }}
          command: pages deploy ./site --project-name=${{ env.CLOUDFLARE_PAGES_PROJECT_NAME }} --branch=${{ steps.pr.outputs.branch }}
      - name: Add branch preview info to PR
        uses: marocchino/sticky-pull-request-comment@v3
        with:
          number: ${{ steps.pr.outputs.pr }}
          header: preview
          message: |
            # Branch preview

            A preview of the website generated with the content of this pull request is available at this URL:

            ${{ steps.deploy.outputs.pages-deployment-alias-url }}