Add Stale issue workflow (#1104)

Author: Garulf

.github/ISSUE_TEMPLATE/workflows/stale.yml

@@ -0,0 +1,23 @@
+# For more information, see:
+# https://github.com/actions/stale
+name: Mark stale issues and pull requests
+
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v4
+        with:
+          stale-issue-message: 'This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.'
+          days-before-stale: 30
+          days-before-close: 5
+          days-before-pr-close: -1
+          exempt-all-milestones: true
+          close-issue-message: 'This issue was closed because it has been stale for 5 days with no activity. If you feel this issue still needs attention please feel free to reopen.'