Add a stale action. (#126)

.github/workflows/stale.yaml

@@ -0,0 +1,23 @@
+name: Close inactive issues
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "30 2 * * 0"
+
+jobs:
+  close-issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v9
+        with:
+          days-before-issue-stale: 365
+          days-before-issue-close: 28
+          stale-issue-label: "stale"
+          stale-issue-message: "This issue is stale because it has been open for 365 days with no activity. This issue will be automatically closed within 28 days if there is no further activity."
+          close-issue-message: "This issue was closed because it has been inactive for 28 days since being marked as stale."
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          repo-token: ${{ secrets.GITHUB_TOKEN }}

changelog

@@ -1,5 +1,6 @@
 0.9.0b16:
   Use async interfaces where possible.
+  Add github stale action.
 0.9.0b15:
   Fix threading issue with cover and valve.
 0.9.0b14: