kubebuilder:validation:Format should apply to array items, not to array

[justinsb]

This is likely a regression / reoccurence of an issue that was originally raised in #141 and fixed in #143, but was broken by refactoring accompanied by removal of the test cases (which would have prevented regression). As such I don't believe the regression is deliberate, although I'm not 100% certain of the correct behaviour.

I have tried to add test cases to show the issue in #952 (based on the original test cases). I believe the format directive should apply to the item, not the slice. To cite the problem from #952 so that we can first agree that the current behaviour is wrong:

	// +kubebuilder:validation:Format=ipv4
	Addresses []string `json:"addresses"`

Currently this produces:

+              addresses:
+                format: ipv4
+                items:
+                  type: string
+                type: array

I believe it should produce:

+              addresses:
+                items:
+                  format: ipv4
+                  type: string
+                type: array

[sbueringer]

I think the current behavior is correct. See also: #342

Since #898 it's now possible to define markers directly on the slice items via e.g. // +kubebuilder:validation:items:MinLength=1