chore: set CODEOWNERS & backport action (#1157)

.github/CODEOWNERS

@@ -0,0 +1,3 @@
+# These owners will be the default owners for everything in
+# the repo. Unless a later match takes precedenc
+* @tkxkd0159 @zemyblue @0Tech @jaeseung-bae

.mergify.yml

@@ -15,4 +15,20 @@ pull_request_rules:
         method: squash
         commit_message_template: |
           {{ title }} (#{{ number }})
-          {{ body }}
+          {{ body }}
+  - name: backport patches to v0.48.x branch
+    conditions:
+      - base=main
+      - label=backport/v0.48.x
+    actions:
+      backport:
+        branches:
+          - release/v0.48.x
+  - name: backport patches to v0.47.x branch
+    conditions:
+      - base=main
+      - label=backport/v0.47.x
+    actions:
+      backport:
+        branches:
+          - release/v0.47.x

CHANGELOG.md

@@ -44,6 +44,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (docs) [\#1120](https://github.com/Finschia/finschia-sdk/pull/1120) Update links in x/foundation README.md
 * (feat) [\#1121](https://github.com/Finschia/finschia-sdk/pull/1121) Add update-censorship cmd to x/foundation cli
 * (server) [#1153](https://github.com/Finschia/finschia-sdk/pull/1153) remove grpc replace directive
+
 ### Bug Fixes
 * chore(deps) [\#1141](https://github.com/Finschia/finschia-sdk/pull/1141) Bump github.com/cosmos/ledger-cosmos-go from 0.12.2 to 0.13.2 to fix ledger signing issue
 
@@ -57,6 +58,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Build, CI
 * (ci) [\#1078](https://github.com/Finschia/finschia-sdk/pull/1078) fix tag comments in github actions workflow docker.yml
+* (repo) [\#1157](https://github.com/Finschia/finschia-sdk/pull/1157) setup CODEOWNERS and backport action
 
 ### Document Updates
 * (docs) [\#1059](https://github.com/Finschia/finschia-sdk/pull/1059) create ERRORS.md for x/module