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Automatic merge from submit-queue (batch tested with PRs 60696, 60876, 60901, 60925, 60428). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. kubeadm: Add writable option to *ExtraVolumes init config **What this PR does / why we need it**: This PR adds `writable` boolean option for each volume under the `apiServerExtraVolumes`, `controllerManagerExtraVolumes` and `schedulerExtraVolumes` kubeadm init config keys. The option controls write access on a per-volume basis. It is inverted and transferred to the corresponding static pod YAML file as the `readOnly` option of kubelet. The default value for `writable` is `false`, which does not change the current kubeadm behavior. **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Partial fix for #58587 **Special notes for your reviewer**: /cc @kubernetes/sig-cluster-lifecycle-pr-reviews /area kubeadm /assign @luxas /assign @timothysc **Release note**: ```release-note kubeadm: Add the writable boolean option to kubeadm config. The option works on a per-volume basis for *ExtraVolumes config keys. ```