Add Issues/PRs autoclose

Signed-off-by: Carlos Rodriguez Hernandez <crhernandez@bitnami.com>

.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: 15
+
+# Number of days of inactivity before a stale Issue or Pull Request is closed.
+daysUntilClose: 5
+
+# Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
+exemptLabels:
+  - on-hold
+
+# Label to use when marking as stale
+staleLabel: stale
+
+issues:
+  # 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 (for 15 days). It will be closed if no further activity occurs. Thanks for the feedback.
+
+  # Comment to post when closing a stale Issue or Pull Request.
+  closeComment: >
+    Due to the lack of activity in the last 5 days since it was marked as "stale", we proceed to close this Issue. Do not hesitate to reopen it later if necessary.
+
+pulls:
+  # Comment to post when marking as stale. Set to `false` to disable
+  markComment: >
+    This Pull Request has been automatically marked as "stale" because it has not had recent activity (for 15 days). It will be closed if no further activity occurs. Thank you for your contribution.
+
+  # Comment to post when closing a stale Issue or Pull Request.
+  closeComment: >
+    Due to the lack of activity in the last 5 days since it was marked as "stale", we proceed to close this Pull Request. Do not hesitate to reopen it later if necessary.
+
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 30
+