Close stale issues with reason completed

Author: mariedm

.github/workflows/stale.yml

@@ -33,6 +33,8 @@ jobs:
           days-before-issue-close: 3
           # Automatically remove the stale label when the issues or the pull requests are updated
           remove-stale-when-updated: true
+          # Specify the reason used when closing issues: `completed` or `not_planned`
+          close-issue-reason: completed
           # Run the stale workflow as dry-run.
           # No GitHub API calls that can alter the issues and pull requests will happen.
           # Useful to debug or when you want to configure the stale workflow safely.