codeql workflow should run for changes to src and scheduled or manual executions

Author: rlindner81

.github/workflows/codeql.yml

@@ -12,10 +12,13 @@
 name: "CodeQL Advanced"
 
 on:
+  workflow_dispatch:
   push:
-    branches: ["main"]
+    branches: [main]
+    paths: [src/**]
   pull_request:
-    branches: ["main"]
+    branches: [main]
+    paths: [src/**]
   schedule:
     - cron: "00 12 * * 5" # every Friday at 12:00