Restrict benchmark auto-push to scheduled runs only

[aaronbuchwald]

Summary

• Restrict gh-pages benchmark auto-push to only schedule events, removing the workflow_dispatch path
• Prevents one-off manual dispatch runs from creating permanent stale graph entries on the benchmark dashboard

Context

We just purged 45 stale benchmark entries from gh-pages (see #5031) that were created by manual workflow_dispatch runs with non-standard runners/configs. The previous condition:

push-github-action-benchmark: ${{ (github.event_name == 'schedule' || (github.event_name == 'workflow_dispatch' && github.repository == 'ava-labs/avalanchego' && github.ref_name == 'master')) && matrix.firewood-ref == '' }}

allowed any workflow_dispatch on master to permanently push results to gh-pages, even when using ad-hoc runners (io2-xfast-10ti, i4i-2xlarge) or configs (firewood, firewood-archive) that aren't in the scheduled matrix.

The new condition:

push-github-action-benchmark: ${{ github.event_name == 'schedule' }}

ensures only codified scheduled benchmark configurations produce persistent tracking data. Manual dispatch runs still execute and produce artifacts/PR comments — they just don't write to gh-pages.

Test plan

• Verify scheduled workflow runs still auto-push (condition is github.event_name == 'schedule')
• Verify manual workflow_dispatch runs no longer auto-push
• Verify PR-triggered runs still skip auto-push (unchanged behavior)

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR ensures benchmark results are only auto-pushed to gh-pages during scheduled workflow runs, preventing manually dispatched benchmark runs (which may use ad-hoc runners/configs) from creating persistent/stale entries on the benchmark dashboard.

Changes:

• Update push-github-action-benchmark gating to github.event_name == 'schedule' in the GH-native workflow.
• Update push-github-action-benchmark gating to github.event_name == 'schedule' in the container workflow.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/c-chain-reexecution-benchmark-gh-native.yml	Restricts benchmark auto-push behavior to scheduled runs only.
.github/workflows/c-chain-reexecution-benchmark-container.yml	Restricts benchmark auto-push behavior to scheduled runs only.

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