improved probes and graceful shutdown for storefront

[henzigo]

No description provided.

[Copilot]

Pull request overview

Updates the Kubernetes Deployment configuration for the storefront container to improve startup behavior, health probing, and termination handling, and refreshes the scenario “expected” manifests accordingly.

Changes:

• Add a startupProbe for storefront and tune livenessProbe / readinessProbe timings and thresholds.
• Adjust preStop hook to run via /bin/sh -lc (sleep delay before termination).
• Document the change in UPGRADE.md and update test scenario expected manifests.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
kubernetes/deployments/storefront.yaml	Adds startupProbe, tunes liveness/readiness probes, and updates preStop command for storefront.
tests/scenarios/basic-production/expected/webserver.yaml	Updates expected manifest output for the new probe + preStop configuration.
tests/scenarios/development-single-domain/expected/webserver.yaml	Updates expected manifest output for the new probe + preStop configuration.
tests/scenarios/escaping-env/expected/webserver.yaml	Updates expected manifest output for the new probe + preStop configuration.
tests/scenarios/production-with-cloudflare/expected/webserver.yaml	Updates expected manifest output for the new probe + preStop configuration.
UPGRADE.md	Adds an upgrade note referencing this change.

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