Provide a way to automatically add license headers

[nikhita]

We periodically see repos being donated to the kubernetes org(s). Donation requires these repos to add boilerplate license headers to all their files. Today, we don't have a way to do this automatically.

kubernetes/repo-infra#82 took a dab at this but was closed due to age.

@dims also pointed a few other alternative approaches:

1. https://github.com/kunalkushwaha/ltag - this is used in containerd
2. https://github.com/google/go-licenses

/help

[k8s-ci-robot]

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In response to this:

We periodically see repos being donated to the kubernetes org(s). Donation requires these repos to add boilerplate license headers to all their files. Today, we don't have a way to do this automatically.

kubernetes/repo-infra#82 took a dab at this but was closed due to age.

@dims also pointed a few other alternative approaches:

1. https://github.com/kunalkushwaha/ltag - this is used in containerd
2. https://github.com/google/go-licenses

/help

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[mohitsharma-in]

/assign