Set permissions for GitHub actions (#8005)

- 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: naveensrinivasan <172697+naveensrinivasan@users.noreply.github.com>

.github/workflows/ci.yml

@@ -35,6 +35,9 @@ on:
     - 'windows/**'
     - 'man/**'
 
+permissions:
+  contents: read
+
 jobs:
   linux:
 

.github/workflows/nightly.yml

@@ -4,6 +4,9 @@ on:
   schedule:
     - cron: '53 7 * * *'
 
+permissions:
+  contents: read
+
 jobs:
   linux: