[ci skip] ci(Mergify): configuration update (#331)

Author: twisti-dev

.mergify.yml

@@ -0,0 +1,28 @@
+pull_request_rules:
+  - name: Make sure PR are update before merging with rebase
+    description: This automatically rebases PRs when they are out-of-date with the
+      base branch to avoid semantic conflicts (next step us switch to merge
+      queue).
+    conditions:
+      - "#commits-behind >= 10"
+    actions:
+      rebase:
+  - name: Label conflicting pull requests
+    description: Add a label to a pull request with conflict to spot it easily
+    conditions:
+      - conflict
+      - -closed
+    actions:
+      label:
+        toggle:
+          - conflict
+  - name: Ping PR author when conflicting
+    description: Warn the pull request author when their PR are conflicting
+    conditions:
+      - conflict
+      - -closed
+    actions:
+      comment:
+        message: >
+          👋 {{author}} your PR is conflicting and needs to be updated to be
+          merged