fix: Potential fix for code scanning alert no. 4: Workflow does not contain permissions (#126)

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: JamieSinn

.github/workflows/test-harness.yml

@@ -7,6 +7,8 @@ on:
 jobs:
   harness-tests:
     name: Harness Tests
+    permissions:
+      contents: read
     runs-on:
       labels: ubuntu-latest-4-core
     steps: