fixed umount error during shutdown

package/harvester-os/files/etc/systemd/system/rke2-shutdown.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Kill RKE2 Containers for clean unmount
+DefaultDependencies=no
+RefuseManualStart=yes
+Before=reboot.target halt.target shutdown.target poweroff.target umount.target final.target
+
+[Install]
+RequiredBy=reboot.target halt.target shutdown.target poweroff.target umount.target final.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/sbin/rke2-kill-containers.sh

package/harvester-os/files/system/oem/91_rke2-shutdown.yaml

@@ -0,0 +1,7 @@
+name: "Enable RKE2 shutdown service"
+stages:
+  initramfs:
+    - name: "enable rke2-shutdown.service"
+      if: 'grep -q root=LABEL=COS_ACTIVE /proc/cmdline && [ -n "$(blkid -L COS_ACTIVE)" ]'
+      commands:
+        - systemctl enable rke2-shutdown.service

package/harvester-os/files/usr/sbin/rke2-kill-containers.sh

@@ -0,0 +1,25 @@
+#!/bin/bash -x
+function list_units() {
+  systemctl list-units --type=scope --no-legend | grep -Eo "(cri-containerd-.+\.scope)"
+}
+
+function get_unit_status() {
+  local unit_name="$1"
+  systemctl status "${unit_name}"
+}
+
+systemctl stop rke2-server.service || true
+systemctl stop rke2-agent.service || true
+
+unit_list=($(list_units))
+
+max_concurrency=$(($(nproc) + 1))
+if [ ${#unit_list[@]} -lt $max_concurrency ]; then
+    max_concurrency=${#unit_list[@]}
+fi
+
+printf '%s\0' "${unit_list[@]}" | xargs -0 -n1 -P "$max_concurrency" sh -c 'sudo systemctl stop --kill-who=all "$@" && echo "Finished $@"' _ | { grep -v '^Finished' || true; } | { grep -v 'xargs:' || true; } &
+wait
+
+echo "Finished stopping all units."
+exit 0