ci: add stale issue automation (#1366)

.github/stale.yaml

@@ -0,0 +1,33 @@
+# Documentation https://github.com/probot/stale
+
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 30
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Only issues or pull requests with all of these labels are check if stale. Defaults to `[]` (disabled)
+onlyLabels:
+  - WaitingForInfo
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - thinking
+  - accepted
+# Set to true to ignore issues with an assignee (defaults to false)
+exemptAssignees: true
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: true
+
+pulls:
+  markComment: >
+    This pull request has been automatically marked as stale because it has not had
+    recent activity. It will be closed if no further activity occurs. Thank you
+    for you
+  onlyLabels:
+    - ChangesRequested
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 1