[GitHub] Add minimum GitHub token permissions for workflows

Signed-off-by: Varun Sharma <varunsh@stepsecurity.io>

.github/workflows/codeql-analysis.yml

@@ -9,6 +9,9 @@ on:
   schedule:
     - cron: '22 1 * * 2'
 
+permissions:
+  contents: read
+
 jobs:
   analyze:
     name: Analyze

.github/workflows/stale-action.yml

@@ -3,8 +3,14 @@ on:
   schedule:
     - cron: "0 0 * * *"
 
+permissions:
+  contents: read
+
 jobs:
   stale:
+    permissions:
+      issues: write  # for actions/stale to close stale issues
+      pull-requests: write  # for actions/stale to close stale PRs
     runs-on: ubuntu-latest
     steps:
       - uses: actions/stale@v4