feat: next release from main branch is 2.7.0 (#1530)

enable releases

Author: chanseokoh

.github/release-please.yml

@@ -11,4 +11,8 @@ branches:
   - bumpMinorPreMajor: true
     handleGHRelease: true
     releaseType: java-yoshi
-    branch: java7
+    branch: java7
+  - releaseType: java-backport
+    bumpMinorPreMajor: true
+    handleGHRelease: true
+    branch: 2.6.x

.github/sync-repo-settings.yaml

@@ -51,6 +51,16 @@ branchProtectionRules:
       - units (8)
       - units (11)
       - cla/google
+  - pattern: 2.6.x
+    isAdminEnforced: true
+    requiredApprovingReviewCount: 1
+    requiresCodeOwnerReviews: true
+    requiresStrictStatusChecks: true
+    requiredStatusCheckContexts:
+      - bazel
+      - units (8)
+      - units (11)
+      - cla/google
 permissionRules:
   - team: yoshi-admins
     permission: admin