Cleanup containers

Author: mcbenjemaa

.github/workflows/e2e.yml

@@ -37,4 +37,6 @@ jobs:
       - name: Cleanup kind clusters
         uses: gacts/run-and-post-run@v1
         with:
-          post: "kind get clusters | xargs -I% kind delete cluster --name %"
+          post: |
+            kind get clusters | xargs -I% kind delete cluster --name %
+            docker system prune -a -f