chore: Adding stale workflow

[devin-ai-integration]

Note

Low Risk
Low risk GitHub Actions change; it only adds a scheduled workflow that can auto-close stale issues/PRs, with limited issues/pull-requests write permissions.

Overview
Adds a new GitHub Actions workflow, stale.yml, that can be run manually or on a daily cron to close stale issues and pull requests.

The job delegates to launchdarkly/gh-actions/.github/workflows/sdk-stale.yml@main and grants issues and pull-requests write permissions to perform the closures.

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Reusable workflow pinned to branch, not commit SHA

Medium Severity

The reusable workflow reference launchdarkly/gh-actions/.github/workflows/sdk-stale.yml@main is pinned to a mutable branch instead of a commit SHA. Every other reference to launchdarkly/gh-actions in this repository is pinned to a specific commit hash (e.g., @2715574e..., @f1760cc5...). Pinning to @main means any change to that branch — including a compromise — would automatically execute in this repo's workflow with write permissions on issues and pull requests.

 

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