chore: add stale workflow for issues and PRs

[marandaneto]

Summary

Add the stale workflow used in posthog-js so this repo automatically manages stale issues and PRs too.

Testing

Reviewed the workflow YAML and verified it configures actions/stale@v10 for both issues and PRs.

[github-actions]

posthog-dotnet Compliance Report

Date: 2026-04-13 09:21:12 UTC
Duration: 172ms

✅ All Tests Passed!

0/0 tests passed

---

[greptile-apps]

Security Review

• Overly broad workflow permission in .github/workflows/stale.yaml: actions: write grants the ability to cancel/delete workflow runs and manage artifacts, which actions/stale@v10 does not need. Only issues: write and pull-requests: write are required. Removing actions: write reduces the attack surface if the action or its supply chain were ever compromised.

Prompt To Fix All With AI

This is a comment left during a code review.
Path: .github/workflows/stale.yaml
Line: 8

Comment:
**Unnecessary `actions: write` permission**

`actions/stale@v10` only requires `issues: write` and `pull-requests: write` to label, comment on, and close stale items. `actions: write` grants the workflow the ability to cancel runs, delete artifacts, and manage workflow permissions — none of which are needed here. Granting it violates the principle of least privilege and expands the blast radius if the `actions/stale` action (or a dependency) were ever compromised.

```suggestion
    issues: write
    pull-requests: write
```

How can I resolve this? If you propose a fix, please make it concise.

_{Reviews (1): Last reviewed commit: "chore: add stale workflow for issues and..." | Re-trigger Greptile}