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/publish-artifacts.yaml

@@ -9,6 +9,9 @@ on:
       - devel
       # Push events to branches matching refs/heads/release-v*
       - 'release-v*'
+permissions:
+  contents: read
+
 jobs:
   push:
     name: Publish artifacts