Add explicit permissions to copilot-setup-steps workflow

Co-authored-by: chrisjsewell <2997570+chrisjsewell@users.noreply.github.com>

Author: Copilot

.github/workflows/copilot-setup-steps.yml

@@ -9,6 +9,8 @@ on:
 jobs:
   setup:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
 
     steps:
     - name: Checkout repository