Improve image pull check

[dimitar-kostadinov]

How to categorize this PR?

/area testing
/kind enhancement

What this PR does / why we need it:
Improves image pull check with following:

• extract the image manifest for Node architecture from the index file
• extract all image layers from the manifest
• ensure that all image layers data files exist in the registry storage

Which issue(s) this PR fixes:
N/A

Special notes for your reviewer:
N/A

Release note:

The verification in the e2e test is enhanced to check that all image layers of an image are present in the registry cache storage.

[ialidzhikov]

Thanks for the PR!

[ialidzhikov]

Can you check why an e2e test failed again?

  [FAILED] Context was cancelled (cause: context deadline exceeded) after 120.001s.
  Expected to successfully find the registry.k8s.io/e2e-test-images/nginx:1.15-4 image in the registry's volume
  Expected success, but got an error:
      <*fmt.wrapError | 0xc0006be7e0>: 
      failed to get the registry.k8s.io/e2e-test-images/nginx:1.15-4 image index digest: context deadline exceeded
      {
          msg: "failed to get the registry.k8s.io/e2e-test-images/nginx:1.15-4 image index digest: context deadline exceeded",
          err: <*errors.joinError | 0xc00033ef48>{
              errs: [
                  <context.deadlineExceededError>{},
              ],
          },
      }
  In [It] at: /home/prow/go/src/github.com/gardener/gardener-extension-registry-cache/test/e2e/cache/create_enabled_delete_shoot_system_components.go:47 @ 09/17/24 14:31:14.818

[ialidzhikov]

@dimitar-kostadinov can you rebase and force push so that the concourse-ci/helmcharts check gets removed on its own?

[ialidzhikov]

/lgtm

[gardener-prow]

LGTM label has been added.

Git tree hash: 5023b69e82db00530270b563b05712027216ca7f

[gardener-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ialidzhikov

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[dimitar-kostadinov]

/test pull-gardener-extension-registry-cache-e2e-kind

[dimitar-kostadinov]

/hold

[gardener-ci-robot]

The Gardener project currently lacks enough active contributors to adequately respond to all PRs.
This bot triages PRs according to the following rules:

• After 15d of inactivity, lifecycle/stale is applied
• After 15d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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You can:

• Mark this PR as fresh with /remove-lifecycle stale
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/lifecycle stale

[ialidzhikov]

/remove-lifecycle stale

[dimitar-kostadinov]

/test pull-gardener-extension-registry-cache-e2e-kind

[dimitar-kostadinov]

/unhold