Update cloud-tpu-presubmit.yml

Author: quoctruong

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

@@ -61,4 +61,4 @@ jobs:
       - name: Build ${{ matrix.artifact }}
         env:
           JAXCI_HERMETIC_PYTHON_VERSION: "${{ matrix.python }}"
-        run: ls
+        run: sleep 100