Fix #8: Workflow does not contain permissions

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

Author: felipe-iar

.github/workflows/ci.yml

@@ -18,6 +18,8 @@ jobs:
   tutorial:
     name: Build tutorial
     runs-on: ubuntu-24.04
+    permissions:
+      contents: read
     container: ghcr.io/iarsystems/arm
     steps:
     - name: Checkout project