Don't pin the base image to an old version (#1370)
Don't pin the base image to an old version (#1370)

Because old version may have security vulnerability, which won't pass google marketplace review
bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration