Add merge queue gating to CI workflow

.github/workflows/ci.yml

@@ -5,6 +5,15 @@ on:
     branches: [ main ]
   pull_request:
     branches: [ main ]
+  merge_group:
+    branches: [ main ]
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   build-and-test: