[github workflows] add permissions

Author: thypon

.github/workflows/audit.yml

@@ -12,6 +12,9 @@ on:
   schedule:
     - cron: '12 13 2 * *'
 
+permissions:
+  contents: read
+
 jobs:
   audit:
     runs-on: ubuntu-latest

.github/workflows/checks.yml

@@ -3,6 +3,9 @@ on:
 
 name: Checks
 
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: ubuntu-latest