ci: Set permissions for GitHub actions

Restrict the GitHub token permissions only to the required ones; this way,
 even if the attackers will succeed in compromising your workflow,
 they won’t be able to do much.

- Included permissions for the action.
https://github.com/ossf/scorecard/blob/main/docs/checks.md#token-permissions

https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs

Signed-off-by: naveen <172697+naveensrinivasan@users.noreply.github.com>
naveensrinivasan <172697+naveensrinivasan@users.noreply.github.com>

.github/workflows/lint-extras.yaml

@@ -5,6 +5,9 @@ on:
   pull_request:
     branches:
       - '*'
+permissions:
+  contents: read
+
 jobs:
   lint-extras:
     name: lint-extras