Add stale.yml

.github/stale.yml

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+# Configuration for probot-stale - https://github.com/probot/stale
+
+# Number of days of inactivity before an Issue or Pull Request becomes stale
+daysUntilStale: 180
+
+# Number of days of inactivity before a stale Issue or Pull Request is closed
+daysUntilClose: 7
+
+# Issues or Pull Requests with these labels will never be considered stale
+exemptLabels:
+  - Bug
+  - Enhancement
+
+# Label to use when marking as stale
+staleLabel: Stale
+
+# Comment to post when marking 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.
+
+# Comment to post when removing the stale label. Set to `false` to disable
+unmarkComment: false
+
+# Comment to post when closing a stale Issue or Pull Request. Set to `false` to disable
+closeComment: false
+
+# Optionally, specify configuration settings that are specific to just 'issues' or 'pulls':
+pulls:
+  daysUntilStale: 30
+  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.