ci: Don't run QNS when a PR is merged

Also don't run it on a schedule anymore.

.github/workflows/qns.yml

@@ -1,16 +1,10 @@
 name: QNS
-
 on:
-  push:
-    branches: ["main"]
-    paths-ignore: ["*.md", "*.png", "*.svg", "LICENSE-*"]
   pull_request:
     branches: ["main"]
+    types: [opened, synchronize, reopened, ready_for_review]
     paths-ignore: ["*.md", "*.png", "*.svg", "LICENSE-*"]
   merge_group:
-  schedule:
-    # Run at 1 AM each day
-    - cron: '0 1 * * *'
   workflow_dispatch:
 
 concurrency: