feat: create update-readme.yml

[lumirlumir]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

Overview

In this PR, I created the update-readme.yml workflow.

I inlined and consolidated the logic that was originally in tools/commit-readme.sh, tools/update-readme.js, and .github/workflows/update-readme.yml in each repository.

The original implementation used the got package to fetch data, but the workflow now runs on Node.js LTS and the native fetch API is available, so the got package is no longer needed.

Support both multirepo and monorepo setups

This workflow works well for both multirepo and monorepo setups.

According to #4, 7 repositories use the update-readme script.

There are two types of the update-readme script: one updates only the root-level README.md (multirepo), and the other updates all README.md files under the packages directory as well as the root-level README.md (monorepo).

I've taken these two types of update-readme script into account.

Multirepo

• https://github.com/eslint/markdown/blob/main/tools/update-readme.js
• https://github.com/eslint/json/blob/main/tools/update-readme.js
• https://github.com/eslint/css/blob/main/tools/update-readme.js
• https://github.com/eslint/code-explorer/blob/main/tools/update-readme.js

Monorepo

• https://github.com/eslint/rewrite/blob/main/tools/update-readme.js
• https://github.com/eslint/js/blob/main/tools/update-readme.js

Exception

eslint/eslint repository is an exception, as it uses a slightly different form of the update-readme script.

• https://github.com/eslint/eslint/blob/main/tools/update-readme.js

How did you test this change?

I've tested the workflow in my personal repository ( https://github.com/lumirlumir/test-update-readme ) with my Personal Access Token and confirmed it works correctly for both multirepo and monorepo setups.

Multirepo test example

lumirlumir/test-update-readme@c066348

https://github.com/lumirlumir/test-update-readme/actions/runs/17358680977/job/49275514381

Monorepo test example

lumirlumir/test-update-readme@c14102e

https://github.com/lumirlumir/test-update-readme/actions/runs/17380613326/job/49337017695

What changes did you make? (Give an overview)

In this PR, I created the update-readme.yml workflow.

Related Issues

Ref: #4

Is there anything you'd like reviewers to focus on?

There is a prerequisite for this workflow to function as expected:

• Is WORKFLOW_PUSH_BOT_TOKEN secret set at the organization level?

[lumirlumir]

If it's okay, could this PR include only a ## Sponsors heading for now, so we can verify the update-readme workflow is working correctly in the workflows repository?