node e2e: Add StartDelay to postStart hook

[hshiina]

What type of PR is this?

/kind bug
/kind flake

What this PR does / why we need it:

Because of #124668, RunTogether() expects the first argument to start before the second argument. However, a regular container and a postStart hook start asynchronously. This fix adds StartDelay to the postStart hook so that the hook starts after the regular container.

An example of the failure is here:

{ failed [FAILED] couldn't find that PostStart-regular-1 ever started, got
0) 2024-05-08 09:07:01.942 +0000 UTC init-1 Starting
1) 2024-05-08 09:07:01.979 +0000 UTC init-1 Started
2) 2024-05-08 09:07:02.007 +0000 UTC init-1 Delaying
3) 2024-05-08 09:07:03.023 +0000 UTC init-1 Exiting
4) 2024-05-08 09:07:03.729 +0000 UTC PostStart-regular-1 Starting
5) 2024-05-08 09:07:03.735 +0000 UTC regular-1 Starting
6) 2024-05-08 09:07:03.754 +0000 UTC PostStart-regular-1 Started
7) 2024-05-08 09:07:03.755 +0000 UTC regular-1 Started
8) 2024-05-08 09:07:03.77 +0000 UTC regular-1 Delaying
9) 2024-05-08 09:07:03.771 +0000 UTC PostStart-regular-1 Delaying
10) 2024-05-08 09:07:04.789 +0000 UTC PostStart-regular-1 Exiting
11) 2024-05-08 09:07:13.862 +0000 UTC regular-1 Exiting
In [It] at: k8s.io/kubernetes/test/e2e_node/container_lifecycle_test.go:286 @ 05/08/24 09:07:17.158
}

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: hshiina
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[k8s-ci-robot]

Hi @hshiina. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[hshiina]

/remove-kind failing-test

[bart0sh]

/ok-to-test

[bart0sh]

/triage accepted
/priority important-soon
/cc @SergeyKanzhelev @kannon92
/cc

[bart0sh]

Just wondering if this test case should even check if poststart and regular container run together, especially if this requires artificially delaying poststart.

[hshiina]

I think it's still worth checking this condition in RunTogether():

kubernetes/test/e2e_node/container_lifecycle_pod_construction.go

Lines 139 to 141 in 03ad8e5

	if rhsStart > lhsExit {
	return fmt.Errorf("expected %s to start before exiting %s, got\n%v", rhs, lhs, o)
	}

Although this doesn't look the primary purpose of this test case, I think it would be better to confirm that a regular container and a postStart hook run concurrently somewhere.

[haircommander]

/assign

[hshiina]

#125282 will fix this problem.