[Docs Site] Post Workers preview URL on PRs

Author: KianNH

.github/workflows/publish-preview.yml

@@ -31,15 +31,25 @@ jobs:
         name: Build
         env:
           NODE_OPTIONS: --max-old-space-size=4096
-      - run: npx wrangler pages deploy --project-name cloudflare-docs dist
-        name: Deploy to Cloudflare Pages
-        env:
-          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
-          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
       - run: npx wrangler versions upload -c ./wrangler-workers.toml
         name: Deploy to Cloudflare Workers
         env:
           CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          WRANGLER_OUTPUT_FILE_PATH: wrangler-logs.json
+      - name: Post preview URL on PR
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          PR=$(gh pr list --head ${{ github.ref_name }} --limit 1 --json number --jq '.[].number')
+
+          if [ -z "$PR" ]; then
+            URL=$(cat wrangler-logs.json | jq 'select(.type=="version-upload") | .preview_url')
+
+            if [ -z "$URL" ]; then
+              BODY="**Preview URL:** $URL"
+              gh pr comment "$PR" --repo ${{ github.repository }} --edit-last --body-file -
+            fi
+          fi
       - uses: actions/cache/save@v4
         if: always()
         with: