build

Add scratch dir to ServingConfig #42851

Job	Run time
multiprocess-checkpoint-benchmarks (Python 3.10, jax=0.6.0)	1s
multiprocess-unit-tests (Python 3.11, jax=newest)	45s
build-export (Python 3.12, jax=newest)	59s
build-orbax-model (Python 3.12, jax=newest)	59s
build-orbax-model (Python 3.10, jax=newest)	57s
build-checkpoint (Python 3.12, jax=newest)	58s
build-export (Python 3.10, jax=newest)	58s
build-checkpoint (Python 3.10, jax=newest)	58s
build-checkpoint (Python 3.10, jax=0.6.0)	58s
build-export (Python 3.10, jax=0.4.34)	59s
build-checkpoint (Python 3.11, jax=newest)	59s
build-export (Python 3.11, jax=newest)	58s
build-orbax-model (Python 3.10, jax=0.5.0)	54s
build-orbax-model (Python 3.11, jax=newest)	52s
	12m 15s

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