Add explicit permissions to integration tests workflow

- Set permissions to {contents: read} for security
- Follows GitHub Actions security best practices
- Limits GITHUB_TOKEN permissions to minimum required

Co-authored-by: blacktop <6118188+blacktop@users.noreply.github.com>

.github/workflows/integration-tests.yml

@@ -18,6 +18,9 @@ on:
 
 jobs:
   integration-test:
+    permissions:
+      contents: read
+    
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]