Only run CodeQL on important branches and when pushing to master

Author: aznhassan

.github/workflows/codeql.yml

@@ -2,7 +2,10 @@ name: "Code scanning - action"
 
 on:
   push:
+    branches: [ 'master', 'stable*', 'v[0-9]*' ]
   pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
   schedule:
     - cron: '0 19 * * 0'