[FAB-16985] Add configuration for stale probot

Signed-off-by: Tiffany Harris <[email protected]>

.github/stale.yml

@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: Apache-2.0
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 1
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 1
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - automation
+# Label to use when marking an issue as stale
+staleLabel: stale
+only: pulls
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  false
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: >
+  This repository is maintained by automation, pull requests should be made against
+  [hyperledger/fabric-protos](https://github.com/hyperledger/fabric-protos).