fix: use correct output variable page_url instead of deployment_url

Author: waldekmastykarz

.github/workflows/build-check.yml

@@ -42,7 +42,7 @@ jobs:
     runs-on: ubuntu-latest
     environment:
       name: github-pages-preview
-      url: ${{ steps.deployment.outputs.deployment_url }}
+      url: ${{ steps.deployment.outputs.page_url }}
     steps:
       - name: Deploy preview to GitHub Pages
         id: deployment