update actions permissions

Author: Jason Kai

.github/workflows/ci.yml

@@ -16,6 +16,9 @@ jobs:
     name: Lint code
     if: github.event.pull_request.merged == false
     runs-on: ubuntu-latest
+    permissions:
+      actions: write
+      contents: read
     strategy:
       matrix:
         python-version: [3.8]
@@ -52,6 +55,9 @@ jobs:
       matrix:
         python-version: [3.8]
         redis-version: [6]
+    permissions:
+      actions: write
+      contents: read
 
     steps:
       - name: Setup environment