add action to close stale issues

.github/workflows/publish.yml

@@ -1,9 +1,9 @@
 name: publish to pypi
 
 on:
+  workflow_dispatch:
   release:
     types: [created]
-  workflow_dispatch:
   
 jobs:
   publish:

.github/workflows/stale-issues.yml

@@ -0,0 +1,18 @@
+name: 'Close stale issues and PRs'
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        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.'
+          close-issue-message: 'This issue was closed because it has been stalled for 5 days with no activity.'
+          days-before-stale: 30
+          days-before-close: 5
+          exempt-all-pr-milestones: true
+          exempt-issue-labels: 'todo'