Fix artifacts URL

Author: josevalim

.github/workflows/artifacts.yml

@@ -13,7 +13,7 @@ permissions:
 jobs:
   notify:
     runs-on: ubuntu-latest
-    if: ${{ github.event.workflow_run.event == 'pull_request' }}
+    if: ${{ github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.pull_requests.length > 0 }}
     steps:
       - uses: actions/github-script@v7
         with:
@@ -30,7 +30,7 @@ jobs:
 
             const pullNumber = context.payload.workflow_run.pull_requests[0].number;
             const artifactId = artifacts.data.artifacts[0].id;
-            const artifactUrl = `${context.payload.workflow_run.artifacts_url}/${artifactId}`;
+            const artifactUrl = `${context.payload.workflow_run.html_url}/artifacts/${artifactId}`;
             const commentBody = `<!-- build-artifact-comment -->\n📦 Docs artifacts are ready: ${artifactUrl}`;
 
             const comments = await github.rest.issues.listComments({