[CI] Add docker-containerd-linux-x86-64 integration test in Prow

Author: divysinghvi

deploy/kicbase/Dockerfile

@@ -172,6 +172,10 @@ RUN install -m 0755 -d /etc/apt/keyrings \
     tee /etc/apt/sources.list.d/docker.list > /dev/null \
     && clean-install docker-ce docker-ce-cli containerd.io docker-buildx-plugin
 
+# Set ulimit for containerd to match docker's default-ulimit setting
+# This ensures consistent file descriptor limits (1048576) across container runtimes
+RUN sed -i '/^\[Service\]/a LimitNOFILE=1048576' /lib/systemd/system/containerd.service
+
 # install buildkit
 RUN export ARCH=$(dpkg --print-architecture | sed 's/ppc64el/ppc64le/' | sed 's/armhf/arm-v7/') \
  && echo "Installing buildkit ..." \

hack/prow/integration_docker_containerd_linux_x86-64.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+# Copyright 2025 The Kubernetes Authors All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+set -x
+
+OS="linux"
+ARCH="amd64"
+DRIVER="docker"
+CONTAINER_RUNTIME="containerd"
+EXTRA_START_ARGS="" 
+EXTRA_TEST_ARGS=""
+JOB_NAME="Docker_Containerd_Linux_x86-64"
+
+git config --global --add safe.directory '*'
+COMMIT=$(git rev-parse HEAD)
+MINIKUBE_LOCATION=$COMMIT
+
+
+# when docker is the driver, we run integration tests directly in prow cluster
+# by default, prow jobs run in root, so we must switch to a non-root user to run docker driver
+
+
+source ./hack/prow/common.sh 

hack/prow/prow.mk

@@ -7,6 +7,12 @@ integration-prow-docker-docker-linux-x86-64:
 	./hack/prow/minikube_cross_build.sh $(GO_VERSION) linux amd64
 	./hack/prow/util/integration_prow_wrapper.sh ./hack/prow/integration_docker_docker_linux_x86-64.sh
 
+integration-prow-docker-containerd-linux-x86-64:
+# 	build first
+#	container-runtime=containerd driver=docker on linux/amd64
+	./hack/prow/minikube_cross_build.sh $(GO_VERSION) linux amd64
+	./hack/prow/util/integration_prow_wrapper.sh ./hack/prow/integration_docker_containerd_linux_x86-64.sh
+
 integration-prow-kvm-docker-linux-x86-64:
 # 	build first
 #	container-runtime=docker driver=kvm on linux/amd64

hack/prow/util/integration_prow_wrapper.sh

@@ -24,7 +24,11 @@ echo "test finished with exit code $result"
 
 items=("testout.txt" "test.json" "junit-unit.xml" "test.html" "test_summary.json")
 for item in "${items[@]}"; do
-  echo "Collecting ${item} to ${ARTIFACTS}/${item}"
-  cp "${item}" "${ARTIFACTS}/${item}"
+  if [ -f "${item}" ]; then
+    echo "Collecting ${item} to ${ARTIFACTS}/${item}"
+    cp "${item}" "${ARTIFACTS}/${item}"
+  else
+    echo "Warning: ${item} not found, skipping"
+  fi
 done
 exit $result