Support stopsignal in kube files

[saolof]

Feature request description

The kubernetes API is getting a field for stop signals added for version 1.33 set to be released in April. This means that the --stop-signal flag can be supported in Kube pod definitions, currently it can only be specified in the CLI or in quadlets.

kubernetes/enhancements#4960

Suggest potential solution

Being able to pass a stop signal for containers in the same way as in the Kubernetes API, by adding the field in the Lifecycle field of Container.

apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  containers:
  - name: nginx
    image: nginx:1.14.2
    lifecycle:
      stopSignal: SIGUSR1

Have you considered any alternatives?

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.

[baude]

care to submit a PR?