ci: run free disk space for documentation workflow too

Signed-off-by: strawberry <strawberry@puppygock.gay>

.github/workflows/documentation.yml

@@ -47,6 +47,9 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
 
     steps:
+      - name: Free Disk Space (Ubuntu)
+        uses: jlumbroso/free-disk-space@main
+
       - name: Sync repository
         uses: actions/checkout@v4