ci: publish benchmarks to GH pages

[austinvazquez]

No description provided.

[Copilot]

Pull request overview

Updates the benchmarks GitHub Actions workflow to persist and publish benchmark results (intended for GitHub Pages/gh-pages) instead of only printing them in the step summary.

Changes:

• Elevates workflow token permissions to allow writing repository contents (and deployments).
• Adds benchmark-action/github-action-benchmark to store Go benchmark results under a per-arch directory.
• Adds a manual git push step intended to publish results to the gh-pages branch.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

deployments: write permission is granted but nothing in this workflow uses the Deployments API (only contents is needed for pushing to a branch). Please remove this permission to follow least-privilege and reduce token scope.

Suggested change

deployments: write

[Copilot]

output-file-path is set to benchmark.json, but this workflow only creates /tmp/bench-output.txt from the go test run. github-action-benchmark will fail (or parse nothing) unless the path points to an existing benchmark output file. Point output-file-path at the file you generate (e.g., /tmp/bench-output.txt), or add a step that actually produces benchmark.json in the expected format.

Suggested change

	output-file-path: 'benchmark.json'
	output-file-path: '/tmp/bench-output.txt'

[Copilot]

This push command is very likely to fail: (1) ghpages is not a ref created anywhere in this job, so git push … ghpages:gh-pages will error unless that branch exists locally; and (2) pushing to a raw https://github.com/... remote won’t use the actions/checkout injected credentials, so it will be unauthenticated. Prefer pushing to origin (with checkout credentials) and push the ref that actually exists (e.g., git push origin HEAD:gh-pages), or enable the benchmark action’s built-in push/gh-pages options and drop the manual git push step.

Suggested change

	- name: Push benchmark result
	run: git push 'https://github.com/containerd/nerdbox.git' ghpages:gh-pages
	auto-push: true
	gh-pages-branch: gh-pages