Running in GCB in a fresh clone of the repository, it seems basic git configuration options are not set so it cannot create a commit and push.

Example GCB: https://pantheon.corp.google.com/cloud-build/builds;region=global/99497506-a034-4c98-ab54-6465abd1d889?e=RetailSupportToolLaunch::RetailSupportToolEnabled,RetailDataQualityGaLaunch::RetailDataQualityGaEnabled&inv=1&invt=Ab5fjQ&mods=allow_workbench_image_override&project=chingor-test