Potential fix for code scanning alert no. 5: Workflow does not contain permissions (microsoft#367)

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

Author: shaahji

.github/workflows/main.yml

@@ -1,6 +1,9 @@
 name: main
 description: "CI workflow for Olive Recipes"
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true