ci(Mergify): configuration update

.mergify.yml

@@ -0,0 +1,42 @@
+pull_request_rules:
+    - name: Auto-close PRs on stable branch
+      conditions:
+          - and:
+                - and:
+                      - author!=tuwafula
+                      - author!=mergify[bot]
+                - or:
+                      - base=version-16
+      actions:
+          close:
+          comment:
+              message: |
+                  @{{author}}, thanks for the contribution, but we do not accept pull requests on a stable branch. Please raise PR on develop branch.
+
+    - name: backport to develop
+      conditions:
+          - label="backport develop"
+      actions:
+          backport:
+              branches:
+                  - develop
+              assignees:
+                  - "{{ author }}"
+
+    - name: backport to version-16-hotfix
+      conditions:
+          - label="backport version-16-hotfix"
+      actions:
+          backport:
+              branches:
+                  - version-16-hotfix
+              assignees:
+                  - "{{ author }}"
+
+    - name: Automatic merge on CI success and review
+      conditions:
+        - status-success=linters
+        - "#approved-reviews-by>=1"
+      actions:
+        merge:
+          method: merge