Add linter for Kubernetes manifests

[tenzen-y]

/kind feature

Describe the solution you'd like
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As discussed in this, it would be better to verify the format of all Kubernetes manifests in this repo by yamllint.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

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[tenzen-y]

/cc @anencore94

[anencore94]

@tenzen-y Sounds good :) I'd like to support to some manifest files