Enable auto cherry pick from the release branch to master. (#4546)

.github/pull_request_template.md

@@ -0,0 +1,22 @@
+---
+name: Pull Request
+about: Add some features, do some cleanup, or fix some bugs.
+---
+
+Please provide a description for what this PR is for.
+
+<description>
+
+And to help us figure out who should review this PR, please 
+put an X in all the areas that this PR affects.
+
+[ ] Configuration Infrastructure
+[ ] Docs
+[ ] Installation
+[ ] Networking
+[ ] Performance and Scalability
+[ ] Policies and Telemetry
+[ ] Security
+[ ] Test and Release
+[ ] User Experience
+[ ] Developer Infrastrcture

.mergify.yml

@@ -21,3 +21,12 @@ pull_request_rules:
       backport:
         branches:
           - release-1.2
+
+  - name: Automatically cherry pick a PR from the release branch to master if the right label is set
+    conditions:
+      - base=release-1.2
+      - label=action/merge-to-master
+    actions:
+      backport:
+        branches:
+          - master