feat: create stale.yml

[lumirlumir]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

Hi,

In this PR, I've added the stale.yml workflow.

I referenced the one from the eslint repository: https://github.com/eslint/eslint/blob/main/.github/workflows/stale.yml

I've left a few comments on some key parts of this PR.

What changes did you make? (Give an overview)

I've added the stale.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 GITHUB_TOKEN secret set at the organization level?

It would be great if these items could be addressed before wrapping up this work!

[nzakas]

Is GITHUB_TOKEN secret set at the organization level?

GITHUB_TOKEN is autogenerated by workflows.
https://docs.github.com/en/actions/tutorials/authenticate-with-github_token

[lumirlumir]

GITHUB_TOKEN is autogenerated by workflows.

Ah, I was confused! Thanks for pointing that out.

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Also, I've added a new commit.

[nzakas]

LGTM. Thanks.

[lumirlumir]

I believe the reason we can't merge this PR is that the branch is out of date.

There is an option to configure this behavior in the repo ruleset, so it might be helpful to take a look at that. (Though I'm not 100% sure.)

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Maybe this option?

[lumirlumir]

I'm trying to update the branch to the latest.

[lumirlumir]

Success. Now, I can see a "Squash and merge" button.