v2 rehearsal: CI checks out the pushed ref instead of the default branch

.gitea/workflows/ci.yaml

@@ -10,7 +10,9 @@ jobs:
         run: |
           rm -rf src
           git clone https://gitea.tose.top/admin/codex-app-server.git src
-          cd src && git rev-parse HEAD
+          cd src && git fetch origin "${{ gitea.ref }}" && git checkout FETCH_HEAD
+          echo "pushed ref: ${{ gitea.ref }}"
+          git rev-parse HEAD && git log --oneline -1
       - name: host tests
         run: cd src && python3 -m unittest discover -s tests -v
       - name: cloud tests