ci: align codeql settings with Security SIG recommendations (#2461)

Author: pichlermarc

.github/workflows/codeql-analysis.yml

@@ -2,17 +2,9 @@ name: "CodeQL Analysis"
 
 on:
   workflow_dispatch:
-  schedule:
-    #        ┌───────────── minute (0 - 59)
-    #        │  ┌───────────── hour (0 - 23)
-    #        │  │ ┌───────────── day of the month (1 - 31)
-    #        │  │ │ ┌───────────── month (1 - 12 or JAN-DEC)
-    #        │  │ │ │ ┌───────────── day of the week (0 - 6 or SUN-SAT)
-    #        │  │ │ │ │
-    #        │  │ │ │ │
-    #        │  │ │ │ │
-    #        *  * * * *
-    - cron: '30 1 * * *'
+  push:
+    branches: [ main ]
+  pull_request:
 
 jobs:
   CodeQL-Build: