ci: define minimal permissions to github workflows (#1295)

Signed-off-by: Diogo Teles Sant'Anna <diogoteles@google.com>

.github/workflows/codeql-analysis.yml

@@ -20,6 +20,10 @@ on:
   schedule:
     - cron: '31 21 * * 6'
 
+# Minimal permissions to be inherited by any job that don't declare it's own permissions
+permissions:
+  contents: read
+
 jobs:
   analyze:
     name: Analyze

.github/workflows/go.yml

@@ -7,6 +7,10 @@ on:
       - main
       - 'release-*'
 
+# Minimal permissions to be inherited by any job that don't declare it's own permissions
+permissions:
+  contents: read
+
 jobs:
   test:
     name: Tests