Support K3S

[abrahamhwj]

OS version： centos 7.9
K3S version：v1.29.5+k3s1

After I installed the kwasm-operator, the runtime did not take effect. I needed to manually restart k3s. After inspecting some of the code, I found that the problem may be due to the script of our project.

In my installation environment, K3S is installed by default at /usr/local/bin/k3s. This causes the current version of the restart script to fail to restart K3S successfully. Perhaps the following content can be added to the script to solve this, but I apologize as I do not currently have a suitable test environment to test it.

elif ls $NODE_ROOT/usr/local/bin/k3s > /dev/null 2>&1 ; then
    nsenter --target 1 --mount --uts --ipc --net -- /bin/systemctl restart k3s
    nsenter --target 1 --mount --uts --ipc --net -- /bin/systemctl restart k3s-agent