Add script to check helm docs are up to date

[eddycharly]

This pull request adds a shell script to verify that helm docs are up to date.

This will be used in a prow job to validate helm docs against pull requests.

The related tektoncd/plumbing issue is here: tektoncd/plumbing#309

[tekton-robot]

Hi @eddycharly. Thanks for your PR.

I'm waiting for a tektoncd 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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[eddycharly]

/cc @vdemeester
/cc @afrittoli

[eddycharly]

/meow

[tekton-robot]

@eddycharly:

In response to this:

/meow

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[vdemeester]

/ok-to-test

[vdemeester]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vdemeester

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