test: Added the permission setting on the workflow (#504)

.github/workflows/e2e_ascend.yml

@@ -18,6 +18,9 @@ on:
       - "**/*.py"
       - .github/workflows/e2e_ascend.yml
 
+permissions:
+  contents: read
+  
 jobs:
   test:
     name: verl Ascend test (self-host)

.github/workflows/secrets_scan.yml

@@ -4,6 +4,9 @@ on:
       - main
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: ubuntu-latest