add permissions to test workflow

Author: brendan-kellam

.github/workflows/test.yaml

@@ -9,6 +9,10 @@ jobs:
   unit-tests:
     name: Run Helm Unit Tests
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      checks: write
+      pull-requests: write
     steps:
       - name: Checkout
         uses: actions/checkout@v4