Add lifecycle hooks test and verify probe coverage

[Copilot]

Adds test coverage for Kubernetes lifecycle hooks (postStart/preStop) and confirms all probe types are tested.

Changes

New test template: 115-lifecycle-hooks.yaml

• postStart hook: Creates marker file at /tmp/poststart-marker, validated by main container
• preStop hook: Logs 3-stage shutdown sequence before termination
• 8 log pattern validations ensure hooks execute in correct order
• 120s timeout accounts for image pulls and hook execution delays

Probe coverage verification

• Existing 090-probes.yaml covers all three probe types: startup, liveness, readiness
• No additional probe tests needed

Implementation notes

The postStart hook uses tee + append to avoid race conditions:

lifecycle:
  postStart:
    exec:
      command: ["/bin/sh", "-c", |
        echo "postStart hook executed!" | tee /tmp/poststart-marker
        echo "postStart hook marker file created" >> /tmp/poststart-marker
      ]

preStop hook output may not be captured by all virtual kubelet implementations. Template includes validation checks but documents this limitation.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add a test case check preStop hook for a pod</issue_title>
<issue_description>Also check that all other kind of kubernetes pod probes are checked</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add a test case check preStop hook for a pod #14

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[dciangot]

LGTM