Fork Preview Deploy #143
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| name: Fork Preview Deploy | |
| on: | |
| workflow_run: | |
| workflows: | |
| - Fork Preview Build | |
| types: | |
| - completed | |
| permissions: | |
| actions: read | |
| contents: read | |
| pull-requests: write | |
| concurrency: | |
| group: fork-preview-deploy-${{ github.event.workflow_run.id }} | |
| cancel-in-progress: false | |
| jobs: | |
| deploy: | |
| if: > | |
| github.event.workflow_run.conclusion == 'success' && | |
| github.event.workflow_run.event == 'pull_request' && | |
| github.event.workflow_run.head_repository.full_name != github.repository | |
| runs-on: ubuntu-latest | |
| env: | |
| PREVIEW_PROJECT: ${{ vars.CLOUDFLARE_PREVIEW_PAGES_PROJECT }} | |
| steps: | |
| - name: Validate preview project configuration | |
| run: | | |
| set -euo pipefail | |
| if [ -z "${PREVIEW_PROJECT}" ]; then | |
| echo "Repository variable CLOUDFLARE_PREVIEW_PAGES_PROJECT is required." >&2 | |
| exit 1 | |
| fi | |
| - name: Download preview artifact | |
| uses: actions/download-artifact@v8 | |
| with: | |
| name: pr-preview-site | |
| path: preview-artifact | |
| run-id: ${{ github.event.workflow_run.id }} | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| - name: Read preview metadata | |
| id: meta | |
| run: | | |
| set -euo pipefail | |
| metadata_file="preview-artifact/.preview-artifact/metadata.json" | |
| pr_number="$(jq -r '.pr_number' "${metadata_file}")" | |
| head_sha="$(jq -r '.head_sha' "${metadata_file}")" | |
| head_ref="$(jq -r '.head_ref' "${metadata_file}")" | |
| preview_branch="pr-${pr_number}" | |
| { | |
| echo "pr_number=${pr_number}" | |
| echo "head_sha=${head_sha}" | |
| echo "head_ref=${head_ref}" | |
| echo "preview_branch=${preview_branch}" | |
| } >> "${GITHUB_OUTPUT}" | |
| - name: Setup Node.js | |
| uses: actions/setup-node@v6 | |
| with: | |
| node-version: 24.15.0 | |
| - name: Deploy preview to Cloudflare Pages | |
| id: deploy | |
| run: | | |
| set -euo pipefail | |
| deploy_log="$(mktemp)" | |
| npx wrangler@4 pages deploy preview-artifact/build \ | |
| --project-name "${PREVIEW_PROJECT}" \ | |
| --branch "${{ steps.meta.outputs.preview_branch }}" \ | |
| --commit-hash "${{ steps.meta.outputs.head_sha }}" \ | |
| --commit-message "PR #${{ steps.meta.outputs.pr_number }} preview deployment" \ | |
| | tee "${deploy_log}" | |
| preview_url="$( | |
| sed -n 's/^.*Deployment alias URL: \(https:\/\/[^[:space:]]*\).*$/\1/p' "${deploy_log}" | tail -n 1 | |
| )" | |
| if [ -z "${preview_url}" ]; then | |
| echo "Unable to determine Cloudflare preview alias URL from Wrangler output." >&2 | |
| exit 1 | |
| fi | |
| echo "preview_url=${preview_url}" >> "${GITHUB_OUTPUT}" | |
| env: | |
| CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_DEPLOY_TOKEN }} | |
| CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }} | |
| - name: Upsert preview comment | |
| uses: actions/github-script@v9 | |
| env: | |
| PREVIEW_URL: ${{ steps.deploy.outputs.preview_url }} | |
| HEAD_REF: ${{ steps.meta.outputs.head_ref }} | |
| with: | |
| script: | | |
| const prNumber = Number("${{ steps.meta.outputs.pr_number }}"); | |
| const body = [ | |
| "## Cloudflare Preview", | |
| "", | |
| `Preview URL: ${process.env.PREVIEW_URL}`, | |
| `Source branch: \`${process.env.HEAD_REF}\``, | |
| `Run: ${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`, | |
| ].join("\n"); | |
| const { data: comments } = await github.rest.issues.listComments({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| issue_number: prNumber, | |
| }); | |
| const existing = comments.find((comment) => | |
| comment.user?.type === "Bot" && comment.body?.startsWith("## Cloudflare Preview") | |
| ); | |
| if (existing) { | |
| await github.rest.issues.updateComment({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| comment_id: existing.id, | |
| body, | |
| }); | |
| return; | |
| } | |
| await github.rest.issues.createComment({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| issue_number: prNumber, | |
| body, | |
| }); |