Fix test not to run on both push and pull_request for PRs

.github/workflows/main.yml

@@ -1,6 +1,16 @@
-on: [push, pull_request, workflow_dispatch]
 name: tests
 
+on:
+  pull_request:
+  merge_group:
+    types: [checks_requested]
+  push:
+    branches:
+      - 'main'
+  workflow_dispatch:
+  schedule:
+    - cron: 0 0 * * *
+
 jobs:
   test:
     runs-on: ${{ matrix.os }}