Adds an environment for creating releases

The `app-id` is only available in the `Automation` environment.

Author: aeisenberg

Diff for: .github/workflows/post-release-mergeback.yml

@@ -20,7 +20,8 @@ on:
 
 jobs:
   merge-back:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
+    environment: Automation
     if: github.repository == 'github/codeql-action'
     env:
       BASE_BRANCH: "${{ github.event.inputs.baseBranch || 'main' }}"