[ci] update review rules (#1239)

* update approval rules

* add comment

cumulus/.github/pr-custom-review.yml

@@ -19,11 +19,20 @@ rules:
     check_type: changed_files
     condition:
       include: .*
-      exclude: ^polkadot-parachains/(statemine|statemint)/src/[^/]+\.rs$
+      # excluding files from 'Runtime files' and 'CI team' rules
+      exclude: ^polkadot-parachains/(statemine|statemint)/src/[^/]+\.rs$|^\.gitlab-ci\.yml|^scripts/ci/.*|^\.github/.*
     min_approvals: 2
     teams:
       - core-devs
 
+  - name: CI team
+    check_type: changed_files
+    condition:
+      include: ^\.gitlab-ci\.yml|^scripts/ci/.*|^\.github/.*
+    min_approvals: 2
+    teams:
+      - ci
+
 prevent-review-request:
   teams:
     - core-devs