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: Writes to file during pod deletion (triggered by cleanup)
• 5 log pattern validations ensure postStart executes correctly
• 30s timeout for postStart validation
• Container runs indefinitely until terminated by pod deletion

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
      ]

The container runs indefinitely (while true; do sleep 30; done) so that preStop is triggered during pod deletion by cleanup, not by normal container exit. preStop hook execution is validated by ensuring the pod deletion completes without errors. Direct log validation of preStop output is not possible because cleanup occurs after validation completes in the test framework.

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

[Copilot]

Pull request overview

Adds a new vk-test-set template intended to validate Kubernetes container lifecycle hooks (postStart/preStop) and documents that existing probe tests already cover startup/liveness/readiness probes.

Changes:

• Added a new 115-lifecycle-hooks.yaml template that uses a postStart hook to create a marker file and validates it from the main container.
• Added log-based validations intended to confirm preStop hook execution order/messages.
• Confirmed probe-type coverage is already handled by existing 090-probes.yaml (no changes made there).

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