[release-ocm-2.16] MGMT-23756: Make InfraEnv CpuArchitecture immutable after creation

[bluesort]

Changing Spec.CpuArchitecture after InfraEnv creation didn't regenerate boot artifacts, causing download links to point to the wrong architecture (e.g., links still pointed to x86_64 after changing to s390x). This fix makes Spec.CpuArchitecture immutable by adding webhook validation that rejects any attempts to modify the field after creation, preventing the inconsistent state.

List all the issues related to this PR

• New Feature
• Enhancement
• Bug fix
• Tests
• Documentation
• CI/CD

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• Automation (CI, tools, etc)
• Cloud
• Operator Managed Deployments
• None

How was this code tested?

• assisted-test-infra environment
• dev-scripts environment
• Reviewer's test appreciated
• Waiting for CI to do a full test run
• Manual (Elaborate on how it was tested)
• No tests needed

Checklist

• Title and description added to both, commit and PR.
• Relevant issues have been associated (see CONTRIBUTING guide)
• This change does not require a documentation update (docstring, docs, README, etc)
• Does this change include unit-tests (note that code changes require unit-tests)

Reviewers Checklist

• Are the title and description (in both PR and commit) meaningful and clear?
• Is there a bug required (and linked) for this change?
• Should this PR be backported?

[openshift-ci-robot]

@bluesort: This pull request references MGMT-23756 which is a valid jira issue.

Details

In response to this:

Changing Spec.CpuArchitecture after InfraEnv creation didn't regenerate boot artifacts, causing download links to point to the wrong architecture (e.g., links still pointed to x86_64 after changing to s390x). This fix makes Spec.CpuArchitecture immutable by adding webhook validation that rejects any attempts to modify the field after creation, preventing the inconsistent state.

List all the issues related to this PR

• New Feature
• Enhancement
• Bug fix
• Tests
• Documentation
• CI/CD

What environments does this code impact?

• Automation (CI, tools, etc)
• Cloud
• Operator Managed Deployments
• None

How was this code tested?

• assisted-test-infra environment
• dev-scripts environment
• Reviewer's test appreciated
• Waiting for CI to do a full test run
• Manual (Elaborate on how it was tested)
• No tests needed

Checklist

• Title and description added to both, commit and PR.
• Relevant issues have been associated (see CONTRIBUTING guide)
• This change does not require a documentation update (docstring, docs, README, etc)
• Does this change include unit-tests (note that code changes require unit-tests)

Reviewers Checklist

• Are the title and description (in both PR and commit) meaningful and clear?
• Is there a bug required (and linked) for this change?
• Should this PR be backported?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.99%. Comparing base (a63230a) to head (ca7e655).
⚠️ Report is 6 commits behind head on release-ocm-2.16.

Additional details and impacted files

@@                 Coverage Diff                  @@
##           release-ocm-2.16   #10103      +/-   ##
====================================================
+ Coverage             43.96%   43.99%   +0.02%     
====================================================
  Files                   415      415              
  Lines                 72040    72055      +15     
====================================================
+ Hits                  31674    31698      +24     
+ Misses                37483    37478       -5     
+ Partials               2883     2879       -4     

Files with missing lines	Coverage Δ
...ks/agentinstall/v1beta1/infraenv_admission_hook.go	87.50% <100.00%> (+1.36%)	⬆️

... and 2 files with indirect coverage changes

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[bluesort]

/cc @eliorerz

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bluesort, gamli75

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[openshift-ci]

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