ci: checkout repo in bot auto-merge workflows (#6535)

* ci: drop --delete-branch from reconcile auto-merge call

The reconcile job runs without a git checkout, so gh pr merge --delete-branch
fails with 'not a git repository' before enabling auto-merge. Auto-merge
itself needs no local git state; branch cleanup is already handled by the
PR-creating workflows.

* ci: checkout repo in bot auto-merge workflows

gh pr merge fails with 'not a git repository' when no checkout is present,
which prevented the reconcile job from enabling auto-merge. Restore the
checkout the previous approval workflow relied on.

.github/workflows/bot-auto-merge-reconcile.yml

@@ -12,6 +12,9 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 15
     steps:
+      - name: Checkout code
+        uses: actions/checkout@v7
+
       - name: Obtain token
         id: obtainToken
         uses: actions/create-github-app-token@v3

.github/workflows/bot-pr-automerge.yml

@@ -20,6 +20,9 @@ jobs:
       github.event.pull_request.head.repo.full_name == github.repository &&
       github.event.pull_request.base.ref == 'dev'
     steps:
+      - name: Checkout code
+        uses: actions/checkout@v7
+
       - name: Obtain token
         id: obtainToken
         uses: actions/create-github-app-token@v3