Enable merge queue (#146)

Author: nfx

.github/workflows/push.yml

@@ -3,8 +3,8 @@ name: build
 on:
   pull_request:
     types: [opened, synchronize]
-  push:
-    branches: [main]
+  merge_group:
+    types: [checks_requested]
 
 env:
   HATCH_VERSION: 1.7.0