CI: fix YAML quoting for Show deployed URL step

Author: Michael Ryan Hunsaker

.github/workflows/site-deploy.yml

@@ -64,4 +64,5 @@ jobs:
 
       - name: Show deployed URL
         if: ${{ always() }}
-        run: echo "Page URL: ${{ steps.deployment.outputs.page_url }}"
+        run: |
+          echo "Page URL: ${{ steps.deployment.outputs.page_url }}"