Potential fix for code scanning alert no. 12: Workflow does not contain permissions

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

Author: garloff

.github/workflows/dryrun-manage-github-repositories.yml

@@ -1,5 +1,7 @@
 ---
 name: Test the management of github repositories
+permissions:
+  contents: read
 
 "on":
   workflow_dispatch: