fix vmcp crd don't reconcile after podtemplatespec changes

[yrobla]

Closes: #2784

[codecov]

Codecov Report

❌ Patch coverage is 35.63218% with 56 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.51%. Comparing base (f57d84a) to head (c034eda).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
...perator/controllers/virtualmcpserver_controller.go	22.22%	35 Missing and 7 partials ⚠️
...perator/controllers/virtualmcpserver_deployment.go	53.33%	8 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2817      +/-   ##
==========================================
- Coverage   56.59%   56.51%   -0.08%     
==========================================
  Files         322      322              
  Lines       31247    31333      +86     
==========================================
+ Hits        17685    17709      +24     
- Misses      12042    12096      +54     
- Partials     1520     1528       +8     

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[Copilot]

Pull request overview

This PR fixes a bug where VirtualMCPServer CRD resources were not being reconciled when PodTemplateSpec changes were made (#2784). The fix adds detection logic for PodTemplateSpec changes and implements strategic merge patching to apply user-provided pod customizations.

Key Changes:

• Added PodTemplateSpec validation early in the reconciliation flow to catch invalid specs before deployment creation
• Implemented podTemplateSpecNeedsUpdate method to detect when user-provided PodTemplateSpec has changed
• Created VirtualMCPServerPodTemplateSpecBuilder to validate and build PodTemplateSpec customizations
• Applied strategic merge patch in applyPodTemplateSpecToDeployment to merge user customizations with controller defaults

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
virtualmcpserver_controller.go	Added PodTemplateSpec validation function and change detection logic in deployment update checks
virtualmcpserver_deployment.go	Implemented strategic merge patch application for PodTemplateSpec and removed obsolete TODO comment
virtualmcpserver_podtemplatespec_builder.go	New builder pattern for validating and constructing PodTemplateSpec customizations
virtualmcpserver_podtemplatespec_test.go	Unit tests for PodTemplateSpec builder validation and parsing
virtualmcpserver_podtemplatespec_reconcile_test.go	Tests for deterministic generation and change detection of PodTemplateSpec updates
virtualmcpserver_controller_test.go	Refactored to use test constants (testVmcpName, testGroupName) for consistency
mcpgroup_controller_test.go	Added testGroupName constant and updated test cases to use it consistently

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[jhrozek]

I think there is quite a lot of code duplication with this PR because the podTemplateSpec in this PR is nearly identical to the one used by MCPServer. I will give claude a shot at unifying those.

[jhrozek]

I split out the pod template spec in #2840 - let's see if it gets accepted and if yes, we should rebase this PR atop it.

[jhrozek]

Follow-up Suggestion: Status Update Pattern Consistency

In validateAndUpdatePodTemplateStatus() (virtualmcpserver_controller.go:268-323), the function updates status directly via r.Status().Update() and meta.SetStatusCondition(), while the rest of the reconciler uses the StatusManager pattern (statusManager.SetCondition(), statusManager.SetPhase(), etc.).

Consider refactoring in a follow-up to use StatusManager consistently for:

• Avoiding potential status update conflicts
• Consistent ObservedGeneration tracking
• Easier maintenance

This is a minor consistency issue and doesn't block the PR.