ci: use unified Rstack ecosystem CI

[fi3ework]

Summary

to use the unified ecosystem CI https://rstack-ecosystem-ci.netlify.app/?stack=rsbuild.

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR refactors the Ecosystem CI workflow to use reusable composite actions from the rspack-contrib/rstack-ecosystem-ci repository, significantly simplifying the workflow configuration.

• Replaced two complex workflow jobs with simpler job definitions that use external composite actions
• Removed the local custom action .github/actions/eco-ci-result
• Updated to use a new GitHub token secret (REPO_RSBUILD_ECO_CI_GITHUB_TOKEN_NEXT)

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/ecosystem-ci.yml	Simplified workflow by replacing inline GitHub script actions and manual comment handling with two external composite actions (ecosystem_ci_dispatch and ecosystem_ci_per_commit)
.github/actions/eco-ci-result/action.yml	Deleted custom action that formatted ecosystem CI results, as this functionality is now handled by the external composite actions

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[Copilot]

Using @main as the action reference creates a moving target that can break the workflow without warning. Consider pinning to a specific commit SHA or version tag for stability and reproducibility.

[chenjiahan]

@fi3ework Could we pin to a release tag and let renovate to upgrade it?

[fi3ework]

cc @yifancong it suddenly occurred to me https://github.com/web-infra-dev/rsdoctor-action also need to tag and release a version in the future as well. 🤣

[chenjiahan]

👏