Update cloud-tpu-presubmit.yml

Author: quoctruong

.github/workflows/cloud-tpu-presubmit.yml

@@ -61,5 +61,5 @@ jobs:
       - name: Build ${{ matrix.artifact }}
         env:
           JAXCI_HERMETIC_PYTHON_VERSION: "${{ matrix.python }}"
-        run: ls
+        run: ls && timeout 30 && ls