chore: Add the workflow that marks stale (#3257)

* Add the workflow that marks stale

Signed-off-by: Jakub Balhar <[email protected]>

* Update texts for close

Update list of excluded labels

Signed-off-by: Jakub Balhar <[email protected]>

---------

Signed-off-by: Jakub Balhar <[email protected]>
Co-authored-by: Pablo Carle <[email protected]>

.github/workflows/stale.yml

@@ -0,0 +1,39 @@
+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '0 */6 * * *'
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v8
+        with:
+          # General rules applied to both, issues and pull requests (PRs)
+          start-date: "2022-07-30T00:00:00Z"
+          days-before-close: 14
+          days-before-stale: 90
+          exempt-all-assignees: true
+          exempt-all-milestones: true
+
+          # Rules applied to Issues
+          exempt-issue-labels: "Feature, bug, Priority: Critical, Priority: High, clarification, community-upvoted, security, keep"
+          stale-issue-message: >
+            This issue has been automatically marked as stale because it has not had
+            recent activity. It will be closed if no further activity occurs.
+          close-issue-message: >
+            This issue has been automatically closed due to lack of activity. If you disagree, please comment on reason 
+            why and reopen the issue
+
+          # Rules applied to PRs
+          exempt-pr-labels: "community-upvoted, clarification, security, keep"
+          stale-pr-message: >
+            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.
+          close-pr-message: >
+            This pull request has been automatically closed due to lack of activity. If you disagree, please comment on 
+            reason why and reopen pull request