close-stale: close stale issues with workflow

Add workflow to close stale issues.

Workflow will first mark the issue as stale if there is
no activity for 60 days, and close it after the next 14 days
if no action is taken.

Signed-off-by: Mateusz Redzynia <mateuszx.redzynia@intel.com>

Author: redzynix

.github/workflows/close-stale.yml

@@ -0,0 +1,31 @@
+---
+name: "Close stale issues"
+
+# yamllint disable-line rule:truthy
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+permissions:
+  contents: read
+
+jobs:
+  stale:
+    name: Find stale issues
+    runs-on: ubuntu-24.04
+    if: github.repository == 'thesofproject/linux'
+    permissions:
+      issues: write
+
+    steps:
+      - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639  # v9.1.0
+        with:
+          stale-issue-message: 'This issue has been marked as stale because it has been open (more
+            than) 60 days with no activity. Remove the stale label or add a comment saying that you
+            would like to have the label removed otherwise this issue will automatically be closed
+            in 14 days. Note, that you can always re-open a closed issue at any time.'
+          days-before-stale: 60
+          days-before-close: 14
+          stale-issue-label: 'stale'
+          exempt-issue-labels: 'metabug,in progress,enhancement'
+          operations-per-run: 400