Cherry pick PR #1248: Guarantee build_id is a string. #389

Job	Run time
raspi-2 / initialize	50s
raspi-2-skia / initialize	45s
raspi-2-skia / docker-build-image	37s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	34s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	8m 26s
raspi-2-skia / raspi-2-skia_debug	10m 46s
raspi-2-skia / raspi-2-skia_qa	7m 35s
raspi-2-skia / raspi-2-skia_gold	7m 31s
raspi-2 / raspi_devel	8m 31s
raspi-2 / raspi_debug	10m 27s
raspi-2 / raspi_qa	7m 59s
raspi-2 / raspi_gold	7m 29s
raspi-2 / sbversion-12_devel	9m 37s
raspi-2 / sbversion-12_debug	10m 6s
raspi-2 / sbversion-12_qa	7m 27s
raspi-2 / sbversion-12_gold	8m 5s
raspi-2 / sbversion-13_devel	8m 58s
raspi-2 / sbversion-13_debug	10m 20s
raspi-2 / sbversion-13_qa	8m 21s
raspi-2 / sbversion-13_gold	7m 30s
raspi-2 / sbversion-14_devel	9m 12s
raspi-2 / sbversion-14_debug	9m 35s
raspi-2 / sbversion-14_qa	7m 40s
raspi-2 / sbversion-14_gold	7m 50s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.type }}	0s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.type }}	0s
	2h 56m 11s

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