base: set entrypoint to dumb-init

[zhangzujian]

Pull Request

• Make sure you have followed Kube-OVN Code Style.

What type of this PR

Examples of user facing changes:

• Features
• Bug fixes
• Docs
• Tests

Which issue(s) this PR fixes

When kube-ovn-conttoller is stopped, the kube-ovn-controller process cannot receive the terminal signal, and the pod keeps in Terminating state until reaching terminationGracePeriodSeconds which is 30s by default.

I0514 02:03:35.241908      29 pod.go:428] take 0 ms to handle sync pod underlay-3836/pod-106582449
I0514 02:03:45.291513      29 endpoint.go:107] update add/update endpoint kube-system/kube-ovn-controller
Log file created at: 2024/05/14 02:04:15
Running on machine: kube-ovn-control-plane
Binary: Built with gc go1.22.3 for linux/amd64
Log line format: [IWEF]mmdd hh:mm:ss.uuuuuu threadid file:line] msg
I0514 02:04:15.949157      29 config.go:308] no --kubeconfig, use in-cluster kubernetes config
I0514 02:04:15.949652      29 k8s.go:27] succeeded to dial apiserver "10.96.0.1:443"
I0514 02:04:15.951865      29 config.go:366] no --kubeconfig, use in-cluster kubernetes config
I0514 02:04:15.952497      29 config.go:300] config is ...
I0514 02:04:15.967558      29 leaderelection.go:250] attempting to acquire leader lease kube-system/kube-ovn-controller...
I0514 02:04:48.654858      29 leaderelection.go:260] successfully acquired lease kube-system/kube-ovn-controller

[fanriming]

Should we explicitly specify /usr/bin/dumb-init in the k8s instance declaration? Since the entrypoint of the image is overwritten by the command field of the k8s instance, it is also possible to use the args field parameter directly.