Add GHA for custom PR review

.github/pr-custom-review.yml

@@ -0,0 +1,18 @@
+rules:
+  - name: Changed runtime files
+    condition: .*/runtime/.*lib.rs
+    check_type: changed_files
+    min_approvals: 2
+    teams:
+      - substrateteamleads
+
+  - name: Substrate developers
+    check_type: changed_files
+    condition: .*
+    any:
+      - min_approvals: 2
+        teams:
+          - core-devs
+      - min_approvals: 1
+        teams:
+          - substrateteamleads

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

@@ -0,0 +1,26 @@
+name: Check reviews
+
+on:
+  pull_request:
+    branches:
+      - master
+      - main
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - review_requested
+      - review_request_removed
+  pull_request_review:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: pr-custom-review
+        uses: paritytech/pr-custom-review@v1
+        with:
+          token: ${{ secrets.PRCR_TOKEN }}
+          locks-review-team: non-parity-devs
+          team-leads-team: substrateteamleads
+          action-review-team: ci