Add a kubebuilder marker to patches to preserve unknow fields

[haiyanmeng]

https://book.kubebuilder.io/reference/markers/crd-processing

Currently, a MOSS controller does not support patches correctly by default. For example, applying the following object would get an error strict decoding error: unknown field "spec.patches[0].apiVersion", unknown field "spec.patches[0].kind", unknown field "spec.patches[0].metadata", unknown field "spec.patches[0].spec".

apiVersion: configdelivery.gke.io/v1beta1
kind: ConfigSync
metadata:
  name: config-sync
spec:
  version: 1.16.1
  patches:
  - apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: reconciler-manager
      namespace: config-management-system
    spec:
      template:
        spec:
          containers:
          - name: reconciler-manager
            resources:
              limits:
                memory: "1Gi"

To fix this, we need to add x-kubernetes-preserve-unknown-fields: true into the patches field of ConfigSync CRD:

              patches:
                items:
                  type: object
                type: array
                x-kubernetes-preserve-unknown-fields: true

[k8s-ci-robot]

Hi @haiyanmeng. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[tomasaschan]

/ok-to-test

[justinsb]

Thank you @haiyanmeng

/approve /lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: haiyanmeng, justinsb, tomasaschan

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