[mallendem]

Remove .github/workflows/co-docs-builder.yml: a label-gated (ci:doc-build) pull_request_target Vercel publish that cannot currently succeed, and that would be unsafe if it were repaired.

It does not work today. Verified by triggering it with a throwaway PR (#7210, closed, branch and temporary label deleted): both pull_request_target runs (opened, labeled) failed at the step Insert PR changes into prebuild with Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under .../workflows/.github/actions/version-content. The cause is that elastic/workflows@main has no .github/actions directory.

• The steps before it succeeded: the job checked out the PR head and, with VERCEL_GITHUB_TOKEN, the site and prebuild repos. The Vercel preview step and the push step were skipped.
• It could not be triggered before this test: the repo has no ci:doc-build label and no files under docs/serverless/, and the workflow has no runs.

Why remove instead of hardening: if the missing action were restored, the callee would check out refs/pull/N/head while *_PUBLIC Vercel secrets and a PAT (VERCEL_GITHUB_TOKEN, which can push to elastic/<prebuild>) are in scope. Making that safe means rebuilding the preview on pull_request or the docs-builder preview from elastic/docs-actions, not editing this file. If anyone still needs a docs-site preview from this repo, that is the follow-up.

Required checks on main (branch protection): CLA and buildkite/docs-build-pr; none come from this workflow. No other references in the repo.

Part of the pull_request_target audit: https://github.com/elastic/observability-robots/issues/5292

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[mergify]

This pull request does not have a backport label. Could you fix it @mallendem? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• v7.x is the label to automatically backport to the 7.x branch.
• v7./d./d is the label to automatically backport to the 7./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

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[mergify]

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