.github: add explicit permissions to workflow for security compliance

Specifically:
- Sets minimal required permissions for actions
- Prevents workflows from running with unnecessarily elevated privileges
- Prepares for compatibility with future GitHub enforcement policies

Signed-off-by: Srikanth Muppandam <[email protected]>

Author: smuppand

.github/workflows/preflight-checker-workflow.yml

@@ -6,6 +6,10 @@ on:
     branches: [ "main" ]
   workflow_dispatch:
 
+permissions:
+ contents: read
+ security-events: write
+
 jobs:
   checker:
     uses: qualcomm-linux/qli-actions/.github/workflows/multi-checker.yml@main