CNFCERT-1258: Add kustomize validation check

[sebrandon1]

Changes:

• Adds a quick PR check that attempts to kustomize build appropriate files. Only runs against main.
• Adds a make path for make test-kustomize which runs the script. Users can run this locally as well as there are safeguards to ensure kustomize exists first.
• Skips YAMLs that might require external plugins. See EXCLUDED_DIRS.

Example of a successful run:

$ make test-kustomize 
./hack/test-kustomize.sh
Checking all kustomization.yaml files can build successfully...

  ./telco-core/configuration: SKIPPED (requires external plugins)
  ./telco-hub/configuration/example-overlays-config/acm: OK
  ./telco-hub/configuration/example-overlays-config/gitops: OK
  ./telco-hub/configuration/example-overlays-config/logging: OK
  ./telco-hub/configuration/example-overlays-config/lso: OK
  ./telco-hub/configuration/example-overlays-config/odf: OK
  ./telco-hub/configuration/example-overlays-config/registry: OK
  ./telco-hub/configuration: OK
  ./telco-hub/configuration/reference-crs: OK
  ./telco-hub/configuration/reference-crs/optional/logging: OK
  ./telco-hub/configuration/reference-crs/optional/lso: OK
  ./telco-hub/configuration/reference-crs/optional/odf-internal: OK
  ./telco-hub/configuration/reference-crs/required/acm: OK
  ./telco-hub/configuration/reference-crs/required/gitops: OK
  ./telco-hub/configuration/reference-crs/required/gitops/ztp-installation: OK
  ./telco-hub/configuration/reference-crs/required/registry: OK
  ./telco-hub/configuration/reference-crs/required/talm: OK
  ./telco-ran/configuration/argocd/deployment: OK
  ./telco-ran/configuration/argocd/example/acmpolicygenerator: SKIPPED (requires external plugins)
  ./telco-ran/configuration/argocd/example/clusterinstance: SKIPPED (requires external plugins)
  ./telco-ran/configuration/argocd/example/image-based-upgrades: SKIPPED (requires external plugins)
  ./telco-ran/configuration/argocd/example/policygentemplates: SKIPPED (requires external plugins)
  ./telco-ran/configuration/argocd/example/siteconfig: SKIPPED (requires external plugins)

Summary: Checked 17 kustomization.yaml files, skipped 6 (require external plugins)
All kustomization files validated successfully!

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sebrandon1
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[sebrandon1]

See that its passing in our PR already 🎉 https://github.com/openshift-kni/telco-reference/actions/runs/18920183024/job/54013929628?pr=433

[lack]

/retest

[openshift-ci-robot]

@sebrandon1: This pull request references CNFCERT-1258 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.22.0" version, but no target version was set.

Details

In response to this:

Changes:

• Adds a quick PR check that attempts to kustomize build appropriate files. Only runs against main.
• Adds a make path for make test-kustomize which runs the script. Users can run this locally as well as there are safeguards to ensure kustomize exists first.
• Skips YAMLs that might require external plugins. See EXCLUDED_DIRS.

Example of a successful run:

$ make test-kustomize 
./hack/test-kustomize.sh
Checking all kustomization.yaml files can build successfully...

 ./telco-core/configuration: SKIPPED (requires external plugins)
 ./telco-hub/configuration/example-overlays-config/acm: OK
 ./telco-hub/configuration/example-overlays-config/gitops: OK
 ./telco-hub/configuration/example-overlays-config/logging: OK
 ./telco-hub/configuration/example-overlays-config/lso: OK
 ./telco-hub/configuration/example-overlays-config/odf: OK
 ./telco-hub/configuration/example-overlays-config/registry: OK
 ./telco-hub/configuration: OK
 ./telco-hub/configuration/reference-crs: OK
 ./telco-hub/configuration/reference-crs/optional/logging: OK
 ./telco-hub/configuration/reference-crs/optional/lso: OK
 ./telco-hub/configuration/reference-crs/optional/odf-internal: OK
 ./telco-hub/configuration/reference-crs/required/acm: OK
 ./telco-hub/configuration/reference-crs/required/gitops: OK
 ./telco-hub/configuration/reference-crs/required/gitops/ztp-installation: OK
 ./telco-hub/configuration/reference-crs/required/registry: OK
 ./telco-hub/configuration/reference-crs/required/talm: OK
 ./telco-ran/configuration/argocd/deployment: OK
 ./telco-ran/configuration/argocd/example/acmpolicygenerator: SKIPPED (requires external plugins)
 ./telco-ran/configuration/argocd/example/clusterinstance: SKIPPED (requires external plugins)
 ./telco-ran/configuration/argocd/example/image-based-upgrades: SKIPPED (requires external plugins)
 ./telco-ran/configuration/argocd/example/policygentemplates: SKIPPED (requires external plugins)
 ./telco-ran/configuration/argocd/example/siteconfig: SKIPPED (requires external plugins)

Summary: Checked 17 kustomization.yaml files, skipped 6 (require external plugins)
All kustomization files validated successfully!

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