close-stale: close stale issues with workflow

Add workflow to close stale issues.

Workflow will first mark issue as stale if there was 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 +1,29 @@
+---
+name: "Close stale issues"
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+permissions:
+  contents: read
+
+jobs:
+  stale:
+    name: Find stale issues
+    runs-on: ubuntu-24.04
+    if: github.repository == 'thesofproject/sof'
+    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: 'blocked,in progress,enhancement'
+          operations-per-run: 400