Added validation ci version

Author: Lumin343

.github/workflows/validate-ci.yml

@@ -5,7 +5,7 @@ name: Validate CI
 on:
   pull_request:
     branches:
-      - 2.5.x
+      - 2.7.x
     # Ignore anything unrelated to a chart release
     paths-ignore:
       - 'charts/couchbase-operator/examples/**'